Counting Numbers

Words for number, to count and related things in Celtic languages.

Numbers

Words marked with a * are reconstructions.

Proto-Celtic *rīmā = number
Old Irish (Goídelc) rím [r͈ʲiːβ̃] = counting, enumerating, number, telling, relating, metrics
rímid [ˈr͈ʲiːβ̃ɨðʲ] = to count, reckon, estimate, impute, compose, recount, relate
Middle Irish (Gaoidhealg) rím = counting, enumerating, number, telling, relating
rímid, rímaid = to count, reckon, estimate, recount, relate, compose
Irish (Gaeilge) ríomh [ɾˠiːvˠ/ɾˠiːw] = enumeration, calculation, computation, narration
ríomhaire = counter, enumerator, calculator, computer
ríomhaireacht = counting, enumeration, calculation, computation
ríomhchláraitheoir = computer programmer
ríomheolaíocht = computer science
Scottish Gaelic (Gàidhlig) rìomh† = reckoning, numbering, computation
rìmh† = number, to reckon, compute
Proto-Brythonic *rriβ̃ = number
Middle Welsh (Kymraec) rif, yrif, rhif = sum, number, etc
rhifo, riuaw, riuaỽ = to count
rifed, riued, ryved = number, many, abundance
Welsh (Cymraeg) rhif [r̥iːv] = the sum, number, as many or numerous (as), a (great) many, crowd, host, multitude, large amount, worth, esteem, honour, praise, figure, digit, numeral, count, reckoning, measure
rhifadwy = countable, numerable
rhif(i)o = to count, number, amount to, enumerate, list, recount, enlist, muster
rhifed = number, many, abundance
Cornish (Kernewek) riv = number
riva = to number
riven = digit
Breton (Brezhoneg) riñv = number

Etymology: from the Proto-Indo-European *h₂rey- (to count, reason, think) [source]. Words from the same root include arithmetic, rhyme, rite, ritual and ready in Englsh, reic (to sell in Irish, řádný (regular) in Czech, and rinda (row, line, queue) in Latvian [source].

Proto-Celtic *adrīmā = counting, number, reckoning
Old Irish (Goídelc) áirem = number, numeral, quantity. amount, sum, reckoning, repute, account
Middle Irish (Gaoidhealg) áirem, áram, arim, ārem = counting, reckoning, estimating, number, numeral, amount, sum
comáirem, comairem, comairemh = reckoning, calculating, computation
Irish (Gaeilge) áireamh = enumeration, census, arithmetric, number, portion
comhair = to count, calculate
comhaireamh = to count, calculation, reckoning
Scottish Gaelic (Gàidhlig) àireamh [aːrʲəv] = number, sum, tally, computation, counting, enumerating; count, enumerate
àireamhach [aːrʲəvəx] = numeral, arithmetician
àireamhachadh [aːrʲəvəxəɣ] = numbering, enumerating, enumeration, calculating, computing, calculation, computation
àireamhail [aːrʲəvəxal] = arithmetical
àireamhachas [aːrʲəvəxəs] = numeracy
àireamhair [aːrʲəvɛrʲ] = calculator (tool), arithmetician
Manx (Gaelg) earroo = number, sum, figure, census, statistics, tell
co-earroo = calculation, computation, counting, telling, to compute, count
earrooaghey = number(ing)
co-earrooaghey = to calculate, calculating, numbering
Proto-Brythonic *ėðriβ̃ = (?)
Middle Welsh (Kymraec) eryryw, eiryf, eirif = number, amount, sum, account, reckoning
Welsh (Cymraeg) eirif = number, amount, a large number, many, sum, account, reckoning
Old Breton (Brethonoc) eirimotor = (?)

Etymology: from the Proto-Celtic *rīmā (number) – see above [source].

Old Irish (Goídelc) uimir = number
Middle Irish (Gaoidhealg) (n)uimir = number
Irish (Gaeilge) uimhir [ˈɪvʲəɾʲ / ˈɨ̞̃vʲəɾʲ] = number, count, aggregate
uimhreoir = numerator
uimhrigh = to number, figure
uimhríocht = arithmetic
uimhríochtúil = arithmetical
uimhriú = numbering, numeration, figuring
uimhriúil = numerical, numeral
Scottish Gaelic (Gàidhlig) uimhir [ɯvɪrʲ] = quantity, amount, number, so/as much/many
fuimhir [fɯvɪrʲ] = quantity, number
uimhireach [ɯvɪrʲəx] = numerous
uimhireach [ɯvɪrʲɪç] = arithmetician
Proto-Brythonic *niβ̃er = number
Old Welsh (Kembraec) nimer = number
Middle Welsh (Kymraec) niuer, niver, nifer = number host, company, retinue, troop, crowd
nifery = to number, enumerate, count
niveredic = counted, numbered
niferawg, niuerawc, nigerog, niverog = numerous, abundant, having hosts, troops, retinues, etc
nifeiriawl, niferawl, niueiriawl = numerous, abundant, numerical
kyfnifer, kyfniuer = as many, equal number, even number, a great many, large number, host
Welsh (Cymraeg) nifer [ˈnɪvɛr] = number, host, company, retinue, troop, crowd
niferu, nifeirio = to number, enumerate, count
niferedig = counted, numbered
niferadol = numerical, pertaining to a census
nifer(i)og = numerous, abundant, having hosts, troops, retinues, etc
nifer(i)ol = numerous, abundant, numerical
cyfnifer = as many, equal number, even number, a great many, large number, host
Middle Cornish (Cernewec) never, niver = number
nevera, nivera, nyfyrys = to number, count, reckon
cyniver, cynyver, cenifer, cenyver, ceniver = so many, as many as, every, every one
Cornish (Kernewek) niver = number
nivera = to count, number
niverek = numerical
niverell = counter, counting device
niveren = numeral
niverenans, niverednans = numbering
niveronieth = arithmetic
niverus = numerous
niveryans = census, count
keniver = as many, everyone, so many
Old Breton (Brethonoc) nimer = number
Middle Breton (Brezonec) niuer, nyuer = number
niueraff = to enumerate, number
Breton (Brezhoneg) niver [ˈniː.vɛr] = number
niveradeg = census
niveradur = ennumeration
niverenn [ni.ˈveː.rɛn] = number
niverennañ = to number
niverer = numerator
nivererezh = numbering
niveridigezh = enumeration, census
niveriñ [niˈveːrĩ] = to enumerate, number
niveroniezh [ˌni.ve.rɔ̃.ˈniː.ɛs] = arithmetic
niverus [ni.ˈveː.rus] = numerous

Etymology: from Latin numerus (number, collection, quantity, time, rhythm) [source], from Proto-Italic *nomezos, from PIE *nem- (to distribute give, take). Words from the same root economic, numb and number, numeral in English, nemen (to take, grasp, grab) in Dutch, nehmen (to take, hold, grasp), and número (number) in Spanish [source].

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Sources: Wiktionary, Etymological Dictionary Of Proto Celtic, In Dúil Bélrai English – Old Irish glossary, eDIL – Electronic Dictionary of the Irish Language, Teanglann.ie, Am Faclair Beag, An etymological dictionary of the Gaelic language, Fockleyreen: Manx – English Dictionary, Online Manx Dictionary, Gaelg Corpus, Geiriadur Prifysgol Cymru, Lexicon cornu-britannicum : a dictionary of the ancient Celtic language of Cornwall, Gerlyver Kernewek, Devri : Le dictionaire diachronique du breton, Dictionnaires bilingues de Francis Favereau / Edition Skol Vreizh, TermOfis

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Hundred

Words for a hundred and related things in Celtic languages:

hundred

Proto-Celtic *kantom = hundred
*kantometos = hundredth
Gaulish *canta = hundred
Old Irish (Goídelc) cét [kʲeːd] = hundred, a hundred people/warriors, troops, battalions
cétmad [ˈkʲeːdṽað] = hundredth
Middle Irish (Gaoidhealg) ced, céit, cét = hundred, a hundred people/warriors, troops, battalions
cétach, cetach = hundredfold, possossing a hundred
cétmad = hundredth
Irish (Gaeilge) céad [ciːa̯d̪ˠ/ceːd̪ˠ] = hundred, century, hundredweight, great, long
céadach = hundredfold, great, immense
céadú = hundredth
céadchosach = centipede
céad míle fáilte = a hundred thousand welcomes
Scottish Gaelic (Gàidhlig) ceud [kʲiəd] = hundred
ceudamh [kʲiadəv] (100ᵐʰ) = hundredth 100ᵗʰ)
ceudad [kʲiədəd] = percent, percentage
ceud mìle fàilte = a hundred thousand welcomes
ceudameatair = centimetre
ceudamhail [kʲiədəval] = percentile
ceud-chasach = centipede
ceudach [kʲiədəx] = hundredfold
Manx (Gaelg) keead [kiːəd] = hundred, century
keeadoo = hundredth
keead blein = centenary
keead filley = hundredfold
keead liauyr/mooar = long hundred
keead-choshagh = centipede
Proto-Brythonic *kant [kant] = hundred
Old Welsh cant = hundred
Middle Welsh (Kymraec) cant, can = hundred
canvet, canuet, kannvet, canved = hundredth
cantref, cantrew, cantreuyt = hundred, cantred, province, district
Welsh (Cymraeg) cant, can [kant/kan] = hundred, a host, hundredweight, percentage; century
canfed (100fed) = hundredth (100th), centesimal, century
canrif = century
cantref = hundred, cantred, province, district
cantro = a hundred times, many times, twisted many times
cantroed = centipede, a hundred feet
cantwll = a hundred holes, riddled with holes
hanner cant = fifty
cant a mil = a hundred and one, a large number
can diolch = many thanks
Middle Cornish (Cernewec) cans = hundred
canquyth, canswyth = a hundred times
Cornish (Kernewek) kans = hundred
kansves = hundredth
kansbledhen = century
kanskradh = centigrade
kanskweyth = a hundred times
kansplek = hundredfold
kansran = percent(age)
Old Breton cant = hundred
Middle Breton (Brezonec) cant, cantt, can, chant = hundred, 100 pounds (lb)
canuet, cantvet, cantved = hundredth
cantved = century
candad, cantad = around hundred
cant(-)doubl = centuple
cantenier, candener, candenyer = centurion
Breton (Brezhoneg) kant [kãn(t)] = hundred
kantvet [ˈkãn.vet] = hundredth
kantved [ˈkãn.vet] = century
kantad [ˈkãn.tat] = around hundred

Etymology: from Proto-Indo-European *ḱm̥tóm (hundred) [source].

Words from the same roots include hundred, century, centigrade, hecatontome (a very large number of books) and hecatologue (a code of 100 rules) in English, and words related to hundred in other Indo-European languages [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Thirty

Words for thirty and related things in Celtic languages.

thirty

Proto-Celtic *trīkontes = thirty
Gaulish tricontis = thirty
Old Irish (Goídelc) trícha [ˈtʲrʲiːxo] = thirty
tríchatmad = thirtieth
tríchtaige = thirty day period
Middle Irish (Gaoidhealg) trícha, triúcha, tricha, triocha, tricho = thirty
tríchatmad, trichatmad, trichadmadh = thirtieth
tríchtaige, trichtaigi = period of 30 days/years, etc
tríchtach, tríteach = thirty-fold, consisting of 30
trícha cét = a military force, political or terrirtorial unit; of force of fighting men, cantred, barony (lit. ‘300’)
Irish (Gaeilge) tríocha = thirty
tríochadú = thirtieth
na tríochaidí = the thirties
tríocha céad = large territorial division, barony
Scottish Gaelic (Gàidhlig) trichead [triçəd] = thirty
tritheadamh (30ᵐʰ) = thirtieth (30ᵗʰ)
na tritheadan = the thirties
Manx (Gaelg) treead = thirty
Proto-Brythonic *trigont = thirty
Old Breton tricont, trigont = thirty
Middle Breton (Brezonec) tregont = thirty
tregontad = about thirty
tregontet, tregontvedenn, tregontvet = thirtieth
tregontkementiñ, tregontvedenniñ = to multiply by thirty
tregontvloaziad = a period of 30 years
Breton (Brezhoneg) tregont [ˈtreːɡɔ̃n(t)] = thirty
tregontved = thirtieth
tregontvedenn = thirtieth part
tragontad = around thirty

Etymology: from Proto-Indo-European *tridḱómt (thirty) from *tri- (three) and *déḱm̥ (ten) [source].

Words from the same roots include thirty in English, tridhjetë (thirty) in Albanian, երեսուն [jɛɾɛˈsun] (thirty) in Armenian, trenta (thirty) in Italian and trente (thirty) in French, and words for thirty in other Indo-European languages [source].

Thirty is also trideg (three-ten) in Welsh in the decimal version of the numbers. For other words for thirty, see the post about words for ten, as thirty is 10 on 20 in the vigesimal system.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Twenty

Words for twenty and related things in Celtic languages:

twenty

Proto-Celtic *wikantī = twenty
Gaulish uoconti = twenty
Old Irish (Goídelc) fiche [ˈfʲixʲe] = twenty
fichetmad = twentieth
fichtige = twenty day/year period
Middle Irish (Gaoidhealg) fiche, fichet, fichit, fichtea = twenty, a score
fichetmad, fichatmath, fichetmudh = twentieth
fichetech = pertaining to twenty
fichtige = a period of twenty (days, years, etc)
Irish (Gaeilge) fiche [ˈfʲɪhə/ˈfʲɪçə/fʲiː] = twenty
(an) fichiú = twentieth
Scottish Gaelic (Gàidhlig) fichead [fiçəd] = twenty, a score
ficheadamh [fiçədəv] (20ᵐʰ) = twentieth (20ᵗʰ)
fichead-shliosnach = icosahedron (a polyhedron with 20 faces)
fichead-fillte = twentyfold
Manx (Gaelg) feed [fiːdʒ] = twenty, a score
feedoo, (yn) eedoo = (the) twentieth
feed cheead = two thousand (twenty hundred)
Proto-Brythonic *ʉgėnt = twenty
Cumbric giggy, jiggit = twenty
Old Welsh uceint = twenty
Middle Welsh (Kymraec) ugein, ugeint, vgein = twenty
vgeinvet, ugeinuet = twentieth
ugeinwyr, vgainwyr, vgain-wr, vgain-ŵr = twenty men
Welsh (Cymraeg) ugain [ˈɪɡai̯n/ˈiːɡai̯n] = twenty, score, twenty-pound note
ugeinfed [ɪˈɡei̯nvɛd] (20fed) = twentieth
ugeiniol = pertaining to twenty, denoting twenty
ugeinw(y)r = twenty men
Middle Cornish (Cernewec) ugans, hugens = twenty, a score
Cornish (Kernewek) ugens, ugans = twenty
ugensves = twentieth
Old Breton ucent = twenty
Middle Breton (Brezonec) vgent, uiguent, ugent = twenty
ugentved = twentieth
ugentvedenn = twentieth part
ugentad = around twenty
ugentvedenni, ugentvedenna = to divide by twenty
ugentveder = a commemoration of 20 years
ugentvederel = vigesimal (20-base numeral system)
Breton (Brezhoneg) ugent [ˈyːɡẽn(t)] = twenty
ugentvet = twentieth
ugentvedenn = twentieth part
ugentad = around twenty

Etymology: from Proto-Indo-European *dwi(h₁)dḱm̥ti (twenty) from *wídḱm̥ti (twenty) [source].

Words from the same roots include بیست‎ (bist – twenty) in Persian (Farsi), बीस (bīs – twenty) in Hindi and Nepali, বিশ (biś – twenty) in Bengali and વીસ (vīs – twenty) in Gujarati, and words for twenty in some other Indo-European languages languages [source].

Incidentally, the English words twenty, and words for twenty in other Germanic languages, are not cognate. Instead they come from the Proto-Germanic roots *twain- (two) ‎and *-tigaz (group of ten) [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Decades

Words for ten and related things in Celtic languages:

ten

Proto-Celtic *dekam = ten
*dekametos = tenth
Celtiberian tekametam = tenth
Gaulish decan = ten
decametos = tenth
Old Irish (Goídelc) deich [dʲexʲ] = ten
dechmad = tenth, ten days
deichenbor = ten people
Middle Irish (Gaoidhealg) deich, dech = ten
dechmad, deachmadh = tenth, ten days
deichenbor, dechnabar, dechnebur = ten people
deichenborach = belonging to a company of ten
deichthriub = The Ten Tribes of Israel
Irish (Gaeilge) deich [dʲɛç/dʲɛh/dʲɛ] = ten
(an) deichiú = tenth, tenth part
deichniúr = ten people
deichbhliantúil = decennial (consisting of or lasting 10 years; occuring every 10 years)
deachú = tenth part, tithe
deachúil = decimal
deachúlaigh = to decimalize
deachúlú = decimalization
Scottish Gaelic (Gàidhlig) deich [dʲeç] = ten
deicheamh [dʲeçəv] (10ᵐʰ) = tenth (10ᵗʰ)
deichnear [dʲeçnər] = ten (people)
deich ar fhichead = thirty
Na Deich Àitheantan = The Ten Commandments
deichead [dʲeçəd] = decade, decimal
deicheachadh = (act of) decimalising, decimalisation
deich-fillte = tenfold
Manx (Gaelg) jeih [d͡ʒɛi] = ten
(yn) jeihoo = (the) tenth
jeihaght = decade, ten
jeih keead = thousand
jeih filley = ten-fold
Jeih Annaghyn = Ten Commandments
Proto-Brythonic *deg [dɛːɡ] = ten
*degβ̃ed [dɛɡˈβ̃ɛːd] = tenth
Cumbric dig, dick, dik = ten
Old Welsh dec = ten
Middle Welsh (Kymraec) dec = ten
decuet, decvet, decfed = tenth
decuettyd = tenth day
dec a hugein(t) = thirty
dec a dugein(t) = fifty
dec a phedwar ugein(t) = ninety
degeir = the Ten Commandments, Decalogue
degniev = ten days
deguyr, degwyr = ten men
Welsh (Cymraeg) deg [deːɡ] = ten
degfed [ˈdɛɡvɛd/ˈdɛɡvad] (10fed) = tenth
degfetydd = tenth day
deg ar hugain = thirty
deg a thrigain = seventy
deg a phedwar ugain = ninety
dega(w)d = decade
degiad = decimal
degoes = ten ages or lifetimes, prolonged life
degol = decimal, metric, tenth part
degolaf, degoli = to decimalize; decimate, tithe
degoliad = decimalization, decmiation, a tithing
dengair = the Ten Commandments, Decalogue
dengnïau = ten days
dengnyn, dengw(y)r = ten men, ten persons
Middle Cornish (Cernewec) dec, dék, dég = ten
dege, degves = tenth
dek warn-ugens, dék war-nugens, degwarnygnas = thirty
deg ha dugans = fifty
Cornish (Kernewek) deg = ten
degves = tenth
deg warn ugens = thirty
deg ha dew ugens = fifty
deg ha tri ugens = seventy
deg ha peswar ugens = ninety
degowek, degoweges = teenage, teenager
degvledhen = decade
Old Breton dec = ten
Middle Breton (Brezonec) dec, dêc, deg, dégeu, dek = ten
decuet, dekved = tenth
dec ha triuguent, dec ha tri vguent = seventy
dec ha peuaruguent = ninety
dek kant, dec-cant, dek-kant = thousand
Breton (Brezhoneg) dek = ten
dekvet = tenth
dek ha tri-ugent = seventy
dek ha pevar-ugent = ninety
Dekalog = Decalogue, the Ten Commandments

Etymology: from Proto-Indo-European *déḱm̥ (ten) and *deḱm̥tós (tenth) [source].

English words from the same roots include ten, decade, decimal and decathlon [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Nine

Words for nine and related things in Celtic languages:

nine

Proto-Celtic *nowan = nine
*naumetos = ninth
Gaulish *nau = nine
nametos = ninth
Old Irish (Goídelc) noí [n͈oːi̯] = nine
nómad = ninth
nónbor = nine people
noínden = nine days
Middle Irish (Gaoidhealg) noí, noi = nine
nómad, nomad = ninth
nónbor = nine people
noínden = nine days
noíchtige = a period of 29 days
nócha, nocha, nochat = ninety
Irish (Gaeilge) naoi [n̪ˠiː/n̪ˠɰiː] = nine
(an) naoú = ninth
naonúr = nine people
naoi déag = nineteen
nócha = ninety
naoichodach = ninefold, having nine parts
Scottish Gaelic (Gàidhlig) naoi(dh) [n̪ˠɯj] = nine
naodh [n̪ˠɯːɣ] = nine
naoitheamh [n̪ˠɤjəv] (9ᵐʰ) = ninth (9ᵗʰ)
naoinear [n̪ˠɯːn̪ʲər] = nine (people)
naoi deug = nineteen
naochad [n̪ˠɯːxəd] = ninety
naoidh-fillte = nonuple, ninefold, nine-ply
Manx (Gaelg) nuy [nɛi/niː] = nine
(yn) nuyoo = (the) ninth
nuy jeig = nineteen
nuy-cheayrtyn, nuy-filley = ninefold
nuy-uillinagh = nonagonal, nonagon
Proto-Brythonic *naw [n͈oːi̯] = nine
*nọβ̃ed = ninth
Old Welsh naw = nine
Middle Welsh (Kymraec) nav, nau, naw = nine
navuet, nauuet, nawued, nawuet = ninth
naw deg, naw-deg = ninety
nawkan, naw cant, nawcant = nine hundred, many, numerous
naw ugein(t) = 180
nawbann, nowban = (having) nine syllables (in Welsh poetry)
nawwell, nawell = nine times better (than), much better
naun, nawn, naon = the ninth hour of the day
naw nyn, nawnyn = nine men
Welsh (Cymraeg) naw [naːu̯/nau̯] = nine
nawfed [ˈnau̯vɛd/ˈnau̯vad] (9fed) = ninth, one of nine, nones (in Roman calendar)
deunaw = eighteen (two nines)
naw deg = ninety
nawcant = nine hundred, many, numerous
nawban, naw ban = (having) nine syllables (in Welsh poetry)
nawell = nine times better (than), much better
nawn = the ninth hour of the day (approx. 3pm) midday, nooon, afternoon
nawnbryd = evening meal, dinner, supper
nawnyn, naw nyn = nine men
nawplyg = ninefold
Middle Cornish (Cernewec) naw = nine
nawnzac, nawntek, nownsec, nowndzhak = nineteen
naiv cans = nine hundred
Cornish (Kernewek) naw = nine
nawves = ninth
nownsek = nineteen
nowsegves = nineteenth
Old Breton nau = nine
Middle Breton (Brezonec) nau, nao, naou, naff, nauë, naü = nine
navet = ninth
nauntec, nantec, nandec = nineteen
naontecvet, nandecvèd, naontekved, naoñteget = nineteenth
nao ugent = 180
Breton (Brezhoneg) nav [ˈnaw] = nine
navet = ninth
naontek = nineteen

Etymology: from Proto-Indo-European *h₁néwn̥ (nine) and *h₁newn̥nós (ninth) [source].

English words from the same roots include nine, and words beginning with ennea-, such as enneagon (a 9-sided polygon) and enneastyle (having 9 columns) [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Eightsome

Words for eight and related things in Celtic languages:

eight

Proto-Celtic *oxtū = eight
*oxtūmetos = eighth
Old Irish (Goídelc) ocht [ˈoxt] = eight
ochtmad [ˈoxtṽað] = eighth
ochtar = a group of eight people
ochtmoga = eighty
Middle Irish (Gaoidhealg) ocht = eight
ochtmad = eighth
ochtur, ochtor, ochtar = eight people/things
ochta = a group of eight things, an octad
ochtmoga, ochtmogo, ochtmogat = eighty
Irish (Gaeilge) ocht [ɔxt̪ˠ/ʌxt̪ˠ]= eight
ochtar = eight (people)
ochtú = eighth, eighth part
ocht déag = eighteen
ochtó = eighty
ochtddach = having eight parts, eightfold
ochtábhó = octavo
ochtach, ochtáibh = octave
ochtagán = octagon
ochtapas = octopus
Scottish Gaelic (Gàidhlig) ochd [ɔxg] = eight
ochdamh [ɔxgəv] (8ᵐʰ) = eighth (8ᵗʰ)
ochdnar [ɔxgnər] = eight people
ochd-fillte = octuple, eightfold, eight-ply
ochd-shliosach = octagon, octahedron
ochd-chasach = octopus
Manx (Gaelg) hoght [hoːx(t)] = eight, octuple
hoghtoo = eighth
hoght jeig = eighteen
hoghtad = eighty
hoght filley, hoght keayrtyn = eightfold
oght-lhiatteeane, hoghtin = octagon
hoght lhiatteeagh = octagonal
hoght-choshagh = octopus
Gaulish oxtu = eight
oxtumetos = eighth
Proto-Brythonic *üiθ [yɨ̯θ] = eight
*üɨθβ̃ed = eighth
Cumbric owera, hovera, haoves = eight
Old Welsh oith = eight
Middle Welsh (Kymraec) uith, wyth, vyth, ỽyth, oeth [sei̯θ] = eight
wythuet, wythued, ỽythuet = eighth
wythnos, vythnos, ỽythnos = week
petheunos, pytheonos, pethawnos = fortnight (two weeks)
Welsh (Cymraeg) wyth [uːɨ̯θ/ʊi̯θ] = eight, octave,
wythfed (8fed) [ˈʊɨ̯θvɛd/ˈʊi̯θvɛd] = eighth, one of eight
wyth deg = eighty
wythdegai = eighties
wythawd = octet, octave
wythblyg = octavo, eightfold, having eight parts
wythnyn = eight persons, eight men
wythochr = octahedron, octagon, octagonal
wythnos [ˈʊɨ̯θnɔs] = week
penwythnos = weekend
pythefnos = fortnight (two weeks)
Middle Cornish (Cernewec) eath = eight
eathas = eighth
eitag, eythek = eighteen
Cornish (Kernewek) eth = eight
ethves = eighth. octave
etek = eighteen
etegves = eighteenth
Old Breton (Brethonoc) eith = eight
Middle Breton (Brezonec) eiz = eight
eizuet, aihuet, eizved = eighth
eiz-ugeñt, heiz-ugent = 160
eiz-cognecq = octagonal
eiz-cornecq = octagonal, octagon
eizuet, aihuet, eizvet, eizved, eihvet = eighth
éih dyad, ein-déad, eih-diat = about eight
eizdezyeg, eizdeziek = weekly
eizvedi = to divide into eight
Breton (Brezhoneg) eizh = eight
eizhved = eighth
eikont = eighty (usually pevar-ugent)
eizhkognek = octagonal

Etymology: from Proto-Indo-European *oḱtṓw (eight) [source]. Words from the same PIE root include eight, and words beginning with octa-/octo-, such as October, octane and octopus in English, and words related to eight in other Indo-European languages [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Hexagonal

Words for six and related things in Celtic languages:

Six

Proto-Celtic *swexs = six
*suexos = sixth
Old Irish (Goídelc) [sʲeː] = six
seisser = six people
séda = six things
seissed [ˈsʲesʲeð] = sixth
sesca [ˈsʲeska] = sixty
Middle Irish (Gaoidhealg) sé, se, sē = six
seisser, seissiur, seissir = six people
seissed, sesset, sesedh, seisedh = sixth, one of six
sé déc = sixteen
sesca, sescot, sescat = sixty
Irish (Gaeilge) [ʃeː/ʃɛ/ʃə]= six
(an) seú = sixth
seisear = six people
sé déag = sixteen
seasca = sixty
Scottish Gaelic (Gàidhlig) sia [ʃia] = six
(an) siathamh [ʃiə.əv] (6ᵐʰ) = sixth (6ᵗʰ)
sianar [ʃianər] = six people
sia deug = sixteen
seasgad [ʃesgəd] = sixty
sia-cheàrnach = hexagon
Manx (Gaelg) shey = six, sextet
sheyoo, (yn) çheyoo = sixth
shey jeig = sixteen
shey jeigoo = sixteenth
shey keayrtyn = sextuple, six times
shey pingyn = sixpence
Gaulish suex = six
suexos = sixth
Proto-Brythonic *hwex [ˈhwɛːx] = six
*hwexed [hwɛˈxɛːd] = sixth
Cumbric sethera, hither = six
Old Welsh chwech = six
Middle Welsh (Kymraec) chwech, whech, whe, hwech, chwe = six
hhuechet, cchuehet, chwechet, whechet = sixth
Welsh (Cymraeg) chwech [χweːχ/hweːχ] = six, sixpence
chweched (6ed) [ˈχwɛχɛd/ˈχwɛχad] = sixth
chwedeg = sixty
chwedegfed = sixieth
chwechant = six hundred
chwecheiniog = sixpenny bit, sixpence
Middle Cornish (Cernewec) huih, hweh, whéh = six
hweffas, wheffes = sixth
whehdeg = sixteen
whehdegvas = sixteenth
Cornish (Kernewek) hwegh = six
hweghves, hweffes = sixth
hwetek = sixteen
hwetegves = sixteenth
hweghmis = semester
Old Breton (Brethonoc) chouech = six
Middle Breton (Brezonec) huech, huec, c’huec’h, chouech, hueh = six
huechuet, huehuet, c’huec’hved = sixth
c’huezec, c’houezek = sixteen
c’houezekved = sixteenth
Breton (Brezhoneg) c’hwec’h [ˈxwɛx] = six
c’hwec’hvet = sixth
c’hwezek = sixteen
c’hwezekvet = sixteenth
c’hwec’h-ugent = 120 (6*20)
c’hwec’h-kement = sextuple
c’hwec’h-kogn = hexagon
c’hwec’h-miz = semester

Etymology: from Proto-Indo-European swéḱs (six). Words from the same PIE root include six, sextuple, and words beginning with hex-, such as hexagon in English, and words for six in other Indo-European languages [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Quintuple

Words for five and related things in Celtic languages:

five

Proto-Celtic *kʷenkʷe = five
*kʷenkʷetos = fifth
Old Irish (Goídelc) cóic [koːɡʲ] = five
cóiced [ˈkoːɡʲeð] = fifth
cóicer = five people, five things
coíca = fifty
Middle Irish (Gaoidhealg) cóic, cúic = five
cóiced, cúced, coigid = fifth
cóicer, cóicir, cuicir = five people/things
cóic deac = fifteen
coíca, coícad, cóic deich = fifty
Irish (Gaeilge) cúig [kuːɟ] = five
cúigiú [kuːˈɟuː/ˈkuːɟu] = fifth
cúigear [ˈkuːɟəɾˠ] = five people/things
cúige = one of five divisions of Ireland, province
caoga = fifty
cúigbhliantúil = five-yearly, quinquennial
cúigchodach = fivefold, quintuple
cúigréad = quintet
Scottish Gaelic (Gàidhlig) còig [koːgʲ] = five
còigeamh(5ᵐʰ) fifth (4ᵗʰ))
còignear [koːgʲn̪ʲər] = five (people)
còigearan [koːgʲəran] = quintuplet
còig-fillte = quintuple, fivefold
caogad [kɯːgəd] = fifty
Manx (Gaelg) queig [kwɛɡ] = five
queigagh, queigoo = fifth
queigad = fifty
queigin, queig-lhiatteean = pentagon
queigane = quintuplet
queig-filley = quintuple, five-fold
Proto-Brythonic *pɨmp [pɨmp] = five
*pɨmped [pɘmˈpɛːd] = fifth
Gaulish pimpe, pempe = five
pimpetos = fifth
Old Welsh pimp = five
petguaret = fifth
pimmunt = fifty
Middle Welsh (Kymraec) pimp, pym(p), pvmp, pum(p) = five
pimphet, pemhet, pimhed, pymhed, pymhet = fifth
pymthec = fifteen
pymwnt, pumhwnt, pemhwnt, pummwnt = fifty
pvmplyc, pymplyg, pumplyg = quintuple, fivefold
Welsh (Cymraeg) pump [pɨ̞mp/pɪmp] = five
pumed [pɛdˈwɛrɨ̞ð] (5ed) = fifth
pumplyg = quintuple, fivefold, folded five times
pumpunt = five pounds, five-pound note, fiver
pedwaraid = set of five, fivesome
pumseiniol = pentatonic (music)
Middle Cornish (Cernewec) pymp, pemp = five
pympes = fifth
pymthec, pemdhac = fifteen
Cornish (Kernewek) pymp = five
pympes, pempes = fifth
pymthek, pemdhek = fifteen
pympbys, pempbes = starfish (“five finger”)
Old Breton pemp = five
Middle Breton (Brezonec) pemp, puemb = five
pempet, peempet, pempvet = fifth
pempaat = to group into five
pempkement = quintuple
pempkementiñ = to quintuple
pempkogneg = pentagon
Breton (Brezhoneg) pemp [pɛmp/pɛ̃mp] = five
pemp(v)et = fifth
pemzek = fifteen
pempad = quintet
pempkorneg = pentagon

Etymology: from Proto-Indo-European *pénkʷe (five) [source].

English words from the same roots include five, fifth, fifty, fifty, quintet, and words beginning with penta-, such as pentathlon and pentameter [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Fourfold

Words for four and related things in Celtic languages:

four

Proto-Celtic *kʷetwares = four
*kʷetwariyos = fourth
Gaulish petru, petuar = four
petuarios = fourth
Old Irish (Goídelc) cethair [ˈkʲeθirʲ] = four
cethramad [ˈkʲeθraṽað] = fourth
cethracha = forty
cethrar = four people
cethardúil = four elements
Middle Irish (Gaoidhealg) cethair = four
cethramad = fourth
cethrar = four people
cethracha = forty
cetharchair = four-sided, square, rectangular
cethairríad = four-wheeled chariot or carriage
cethardenus = space of four days
cethardóit = group of four
cetharaird = the four points of the compass, the four quarters, the world, universe
Irish (Gaeilge) ceathair [ˈcahəɾʲ/ˈcæɾʲ] = four, quadruped
ceithre [ˈcɛɾʲə/ˈçɛɾʲə] = four
ceathrar [ˈcahɾˠəɾˠ/cæːɾˠ] = four people
ceathracha = forty
ceathrú [cahˈɾˠuː] = quarter, thigh, quatrain
ceathrúnach = quartermaster
ceathairbhliantúil = quadrennial
ceathairchodach = fourfold, quadruple
ceathairchosach = fourfooted, quadruped
ceathairéad = quartet
ceathairfhillte = quarto, fourfold
Scottish Gaelic (Gàidhlig) ceithir [kʲehɪrʲ] = four
ceathramh [kʲɛrəv] (4mh) fourth (4th)
ceathrar [kʲɛrər] = four (people)
ceathrad [kʲɛrəd] = forty
cairteal [kar̪ˠʃdʲal] = quarter; quarters, lodgings
ceithir-chasach = quadruped, four-legged animal
ceithir-cheàrnach = quadrilateral
ceithir-fillte = quadruple, fourfold, four-ply
Manx (Gaelg) kiare [kʲeːə(r)] = four, foursome, quartet
kiarroo, (yn) chiarroo = (the) fourth
kerroo = fourth, quarter, quatrain
kiarad = forty
kiare-fillagh, kiare-filley = fourfold, quadruple
kiare-lhiatteeagh, kiare-lhiatteean = four-sided, quadrilateral
kiare-chassagh = four-footed, four-legged, quadruped
Proto-Brythonic *pedwar [pɛdˈwaːr] = four
*pėdwėrɨð [pe̝dwe̝ˈrˑɨːð] = fourth
Old Welsh petguar = four
petguaret = fourth
Middle Welsh (Kymraec) pedwar, peduar = four (m)
pedeyr, pedair, pedeir = four (f)
pedweryd = fourth (m)
pedwyred = fourth (m)
pedwar deg, pedeir deg = fourteen
pedwar/pedeir ar bymthec = nineteen
pedwar ugein(t) = eighty
Welsh (Cymraeg) pedwar [ˈpɛdwar] = four (m)
pedair [ˈpɛdai̯r/ˈpeːdai̯r] = four (f)
pedwerydd [pɛdˈwɛrɨ̞ð] (4ydd) = fourth (m)
pedwaredd [pɛdˈwarɛð] (4edd) = fourth (f)
pedwarplyg = quadruple
pedwaraf, pedwaru = to divide into four, quarter
pedwaraid = set of four, foursome
pedwar ar ddeg = fourteen
pedwar ar bymtheg = nineteen
pedwar deg = forty
pedwar ugain = eighty
Middle Cornish (Cernewec) peswar = four (m)
pedar = four (f)
peswere, pyswere = fourth
peswardhec, pazawardhak = fourteen
padzhar iganz = eighty
padzhar iganz ha deg = ninety
Cornish (Kernewek) peswar, pajar = four (m)
peder = four (f)
peswora, pajwora = fourth
peswartrosek = fourfooted
peswardhek = fourteen
peswar ugens = eighty
Old Breton petguar = four
petguare = fourth
Middle Breton (Brezonec) peuar, puar = four
peuare, pevare = fourth
peuarzec, pévarzecq, piarzeg = fourteen
peuaruguent, pêver huguent, pévar uguent = eighty
pevar-benveg = quartet
pevarc’hartier = to cut in quarters
pévar c’hemend = quadruple
pevar(-)c’hementi(ñ) = to quadruple
Breton (Brezhoneg) pevar = four (m)
peder = four (f)
pevare = fourth
pevarved = fourth (m)
pedervet = fourth (f)
pevarzek = fourteen
pevar-ugent = eighty
pevarad = quartet
pevarzuek = quadrilatéral

Etymology: from Proto-Indo-European *kʷetwóres (four) and *kʷetwr̥yós (fourth) [source].

English words from the same roots include four, quarter, quart, quartet, quaruple, and words beginning with tetra-, such as tetradecimal (a 14-base counting system) [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic