Fingers and Toes

Words for finger, toe and related things in Celtic languages.

Laugh

Proto-Celtic *makro = finger
Old Irish (Goídelc) mér [mʲeːr] = finger, digit, toe
Middle Irish (Gaoidhealg) mér, mer, meóir, meúir = finger, digit, toe
Irish (Gaeilge) méar [mʲeːɾˠ] = finger, digit, toe, leg (of crustaceans, mollusks, etc), arm (of a cuttle fish)
an mhéar thosaigh/cholbha = the forefinger, index finger
an mhéar fhada/láir/mheáin = (the) middle finger
méar an fháinne = ring finger
an mhéar bheag / lúidín / lúideog = (the) little finger
méar coise = toe
Scottish Gaelic (Gàidhlig) meur [miar] = finger, digit, branch (of an organisation/family), key (in music), point (of an antler), knot (in wood)
meur-meomhair = forefinger, index finger
meur-meadhain / (am) meur fada / (am) meur meadhanach = middle finger
màthair na lùdaige / mac an aba / am madadh fada = ring finger
meur beag an airgid / plaoisgeag = little finger
Manx (Gaelg) mair = finger, digit, prong, ray, (piano) key, hand (of clock), tributary (of river)
corrag / corvair = the forefinger, index finger
mair vooar = the middle finger
mair ny fainey = ring finger
mair veg = the little finger
mair chass / mair choshey = toe
mair choshey veg / mair veg ny coshey = little toe

Etymology: possibly from the Proto-Indo-European *mh₂ḱros (lean, meager), which is also the root of the English word meagre/meager, the French word maigre (meagre, skinny, lean, thin), and the Spanish word magro (lean)[source].

Proto-Celtic *bissī / *bistis = finger
Old Irish (Goídelc) biss = icicle
Middle Welsh (Kymraec) biss, byss, bys = finger, toe, latch
Welsh (Cymraeg) bys [bɨːs / biːs] = finger (of hand/glove), toe; medium, agency; hand (of clock); latch
bys bawd = thumb
bys blaen = forefinger, index finger
bys y cogwrn = middle finger (“knuckle finger”)
bys y gyfaredd = ring finger
bys bach = little finger, ear-finger; minute-hand
bys(i)aid = as much as can be held on or taken up by the finger, a pinch
byseddaf, byseddu, bysedda = to finger, thumb, use the fingers
byseddog = having fingers, fingered
byseg = thimble
bysfedd = finger’s breadth, digit
byson = ring for the finger
Old Cornish bis/bes = finger
Middle Cornish (Cernewec) bis, bes = finger
bis truit = toe
bisou, besaw = ring
Cornish (Kernewek) bys, bes = finger, digit
bys bras = thumb
bys rag = index finger
bys kres = middle finger
bys bysow = ring finger
bys byghan / bes bian = little finger
byskon = thimble
bysow, besow = ring
Middle Breton (Brezonec) bes, bys, bis = finger
besou, bisou = ring
Breton (Brezhoneg) biz [biːs] = finger, hand (of clock), tooth (of tool), leg (of anchor), tentacle, tendril
biz-meud = thumb
biz-yod = index finger
biz bras = middle finger
biz-gwalenn / biz bizou = ring finger
biz bihan / skouarnel = little finger
bizou, bizoù [ˈbiːzu] = ring, jewel
bizouier = jeweller
bizour = jewel

Etymology: from the Proto-Indo-European *gʷist- (twig, finger). The French word bijou (a piece of jewellry), comes from the same root, via the Breton bizoù (ring), from biz (finger) [source].

Proto-Celtic *māto = finger
Old Welsh (Kymraec) máut = finger, toe, latch
Middle Welsh (Kymraec) mawd, baut, bawd = finger, toe, latch
Welsh (Cymraeg) bawd = thumb, big toe; claw (of crab), hoof
bawd troed = big toe
bawdheglaf, bawdheglu = to hitch-hike
Middle Cornish (Cernewec) meut = thumb
Cornish (Kernewek) meus = thumb
meusva = inch
meusya = to hitchhike
Middle Breton (Brezonec) meut = thumb
Breton (Brezhoneg) meud [ˈmøːt] = thumb, pincer, claw
meud-troad = big toe, toe
meudadenn = grip (of the thumb)
meudata = to knead with one’s thumb

Etymology: from the Proto-Indo-European *mē- [source].

Old Irish (Goídelc) ordu = thumb, big toe
Middle Irish (Gaoidhealg) ordu, órdu = thumb, big toe
Irish (Gaeilge) ordóg [ˈəuɾˠd̪ˠoːɡ] = thumb, big toe, claw, pincers, bit, piece, fragment
ordóg coise = big toe
Scottish Gaelic (Gàidhlig) òrdag [ɔːr̪ˠdag] = thumb, big toe
òrdag-coise / òrdag-mhór = big toe
òrdag-làimhe = thumb
òrdag bheag an airgid = little toe, little finger
Manx (Gaelg) ordaag = thumb
ordaag chass / ordaag choshey / ordaag vooar = big toe

Etymology: possibly from the Old Irish ord/ordd (hammer, piece, fragment, stub), from the Proto-Celtic *ordos (hammer) [source].

Old Irish (Goídelc) ladar = grasp, grip
Middle Irish (Gaoidhealg) ladar, ladair = fork or space between the fingers or between the thumb and the rest of the hand; grip, grasp; space between the toes
Irish (Gaeilge) ladhar [lˠaiɾˠ] = space between toes or fingers, toe, claw, prong, (clawed) hand
ladhar mhór = big toe
ladhar bheag = little toe
laidhricín = little toe, little finger
lúidín / lúideog = little finger, little toe
lúidín coise = little toe
Scottish Gaelic (Gàidhlig) ladhar [l̪ˠɤ.ər] = hoof, prong, toe, claw (of lobster)
ladhrag [l̪ˠɤːrag] = toe, prong, hoof
an ladhar mór = big toe
lùdag / lùdag bheag / lùdag dhubh na catha [l̪ˠuːdag] = little finger, hinge

Etymology: unknown [source].

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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, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Seals

Words for seal and other creatures in Celtic languages.

Seals

Species of seals that may be found around the Celtic lands include the common or harbour seal (Phoca vitulina) and the grey seal (Halichoerus grypus). Other species are available.

Words marked with a * are reconstructions.

Old Irish (Goídelc) rón = seal
Middle Irish (Gaoidhealg) rón, ron = seal
Irish (Gaeilge) rón = seal
rón beag = harbour/common seal
rón glas = grey seal
rónach = seals, abounding in seals
cladach rónta = shoal of seals
Scottish Gaelic (Gàidhlig) ròn [r̪ˠɔːn] = seal
ròn cumanta / ròn-dubh = harbour/common seal
ròn glas = grey seal
rònan [r̪ˠɔːnan] = little seal
rònach [r̪ˠɔːnəx] = pertaining to or abounding in seals
rònanach [r̪ˠɔːnanəx] = pertaining to or abounding in little seals
Manx (Gaelg) raun = seal
raun beg = harbour/common seal
raun glass/ghlass = grey seal
raunagh = seal-like, seal hunt
Middle Welsh (Kymraec) moelronyeit, moelrawn, moelrhawn = hippopotamus, seal
Welsh (Cymraeg) moelrhon, moelrhawn = seal, porpoise, dophin, hippopotamus
moelrhonaidd = seal-like
moelrhoniwr = seal hunter
Cornish (Kernewek) reun = seal
reun kemmyn = harbour/common seal
reun loos = grey seal
Breton (Brezhoneg) reunig = seal
reunig morleue = harbour/common seal
reunig gris = grey seal

Etymology: possibly from Old English hran (whale), from Proto-Germanic *harza/harza- (a kind of fish). Incidentally, the Irish name Rónán means “little seal” [source].

Middle Welsh (Kymraec) morhwch, morwch = seal, porpoise, dolphin
Welsh (Cymraeg) morwch, môr-hwch = seal, porpoise, dolphin
Old Cornish morhoch = porpoise
Middle Cornish (Cernewec) morhoch = porpoise
Cornish (Kernewek) morhogh = porpoise
Middle Breton (Brezonec) morhouch, mourouch, moroch = porpoise
Breton (Brezhoneg) morhoc’h = porpoise

Etymology (Welsh): from môr (sea) and hwch (calf). The words in Cornish and Breton come from similar roots [source].

Middle Welsh (Kymraec) morylo = seal
Welsh (Cymraeg) morlo [ˈmɔrlɔ] = seal, sealskin
morlo cyffredin = common seal
morlo llwyd = grey seal
Breton (Brezhoneg) leue-mor = seal

Etymology (Welsh): from môr (sea) and llo (calf). The word in Breton come from similar roots [source].

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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, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Swans

Words for swan (cygnus) in Celtic languages.

Swans, etc

Proto-Celtic *eli- = swan
Gaulish ala = swan
alauda = skylark
Old Irish (Goídelc) elu = swan
Middle Irish (Gaoidhealg) ela(e) = swan
Irish (Gaeilge) eala [ˈalˠə] = swan
ealach = frequented by swans
eala bhalbh = mute swan (Cygnus olor)
eala ghlorach = whooper swan (Cygnus cygnus)
Scottish Gaelic (Gàidhlig) eala [jal̪ˠə] = swan
eala bhàn = mute swan
eala fhiadhaich = whooper swan
ealag, eala-ghlas = cygnet, young swan
eala-bheag = Bewick’s (tundra) swan (Cygnus columbianus bewickii)
Manx (Gaelg) olla, ollay = (mute) swan
ollay chiaulee = whooper swan
eean olla = cygnet
Proto-Brythonic alarkos = swan
Middle Welsh (Kymraec) alarch = swan
Welsh (Cymraeg) alarch [ˈalarχ/ˈaːlarχ] = swan, the constellation Cygnus
alarchaidd = pertaining to a swan, swanlike
alarchen = cygnet
alarches = female swan
alarchwedd = swanlike
alarch dôf, alarch mud = mute swan
alarch y gogledd, alarch chwibanol, alarch gwyllt = whooper swan
Old Cornish elerch = swan
Middle Cornish (Cernewec) elerch = swan
Cornish (Kernewek) alargh = (mute) swan
Middle Breton (Brezonec) alarc’h = swan
alarc’hez = female cygnet
Breton (Brezhoneg) alarc’h = swan
alarc’h roueel = mute swan
alarc’h-kristilh = whooper swan

Etymology: from the Proto-Indo-European *h₁el- (swan, bird, waterfowl) [source].

Words from the same Proto-Celtic root include alondra (lark) in Spanish, alouette (lark) in French, and allodola (skylark) in Italian. They were probably borrowed from the Gaulish alauda (skylark), from ala (swan) [Source].

Words from the same PIE root include auk (swan) in English, alke (auk) in Danish and Norwegian, and álka (razorbill) in Faroese and Icelandic [Source].

Words marked with a * are reconstructions.

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, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Herons

Words for heron in Celtic languages.

Proto-Celtic *korxsā / *korxsiyos = heron
Celtiberian *cárcia = heron
Old Irish (Goídelc) corr = crane, heron, stork, crane
Middle Irish (Gaoidhealg) corr = (grey) heron, stork, crane, leg-necked person
Irish (Gaeilge) corr [kəuɾˠ] = (grey) heron, stork, crane, leg-necked person
Scottish Gaelic (Gàidhlig) corra [kɔr̪ˠə] = heron, stork, crane
Manx (Gaelg) coar = heron, stork, crane
Proto-Brythonic *krɨxɨð = heron
Middle Welsh (Kymraec) crychyd, krechydd, crechydd = heron
Welsh (Cymraeg) crychydd [ˈkrəχɨ̞ð / ˈkrəχɪð] = heron
Old Cornish cherhit = heron
Middle Cornish (Cernewec) cerhidh = heron
Cornish (Kernewek) kerghydh = heron
Old Breton corcid = heron
Middle Breton (Brezonec) quercheiz, querch-eïz, querc’heiz, qarc’hleyz kerc’heiz = heron
Breton (Brezhoneg) kerc’heiz = heron

Etymology: possibly immitative in origin. Words for heron in Spanish (garza) and Portuguese (garça) come from the Celtiberian root [source].

Proto-Brythonic *krexVr = heron
Middle Welsh (Kymraec) crehyr = heron
Welsh (Cymraeg) crëyr [ˈkrɛ.ɨ̞r / kreː.ɪr] = heron

Etymology: possibly from the Proto-Indo-European *(s)ḱrey- (to scream, screech) [source].

Words marked with a * are reconstructions.

Heron

Sources: Wiktionary, Am Faclair Beag, MacBain’s Dictionary, In Dúil Bélrai English – Old-Irish Glossary, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Pigeons and Doves

Words for pigeon and doves in Celtic languages.

Old Irish (Goídelc) columb [ˈkolumb] = dove
colmán = wood-pigeon, ring-dove
Middle Irish (Gaoidhealg) colum [ˈkolumb] = dove
Irish (Gaeilge) colm [ˈkɔl̪ˠəmˠ / ˈkʌl̪ˠəmˠ] = dove, pigeon
colmán = (little) dove, pigeon
Scottish Gaelic (Gàidhlig) calman [kal̪ˠaman] = dove, pigeon
colman [kɔl̪ˠɔman] = dove, pigeon
Manx (Gaelg) calmane / colmane = pigeon, dove
Welsh (Cymraeg) colomen / clomen = dove, pigeon, culver; symbol of peace
Old Cornish colom = dove, pigeon
Middle Cornish colomen = dove, pigeon
Cornish (Kernewek) kolom = dove, pigeon
Breton (Brezhoneg) koulm / koulom = dove

Etymology: from the Latin columbus (dove, pigeon), from Ancient Greek κόλυμβος (kólumbos – a diver), from κολυμβάω (kolumbáō – dive, plunge headlong, swim) [source].

Breton (Brezhoneg) pichon = pigeon

Etymology: unknown

Words marked with a * are reconstructions.

Our Doves

Here’s a tune I wrote called The Curious Pigeon / Y Colomen Chwilfrydig:

Sources: Wiktionary, Am Faclair Beag, MacBain’s Dictionary, In Dúil Bélrai English – Old-Irish Glossary, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Cockerels / Roosters

Words for cockerel / rooster in Celtic languages.

Cockerel

Proto-Celtic *kalyākos = cockerel, rooster
Old Irish (Goídelc) cailech [ˈkalʲex] = cockerel, rooster
Irish (Gaeilge) coileach [ˈkalʲex / ˈkɛlʲəx / ˈkɛlʲax] = cockerel, rooster
Scottish Gaelic (Gàidhlig) coileach [ˈkɤləx] = cockerel, rooster; male bird of any species; male lobster;
coilich = cockerels, etc; eddies, rapids, white water
Manx (Gaelg) kellagh = cock(erel), cock (of anchor), rooster, cock bird
Proto-Brythonic *kėljọg [ke̝lˈjɔːɡ] = cockerel, rooster
Middle Welsh (Kymraec) keylyauc, keilyawc = cockerel, rooster
Welsh (Cymraeg) ceiliog [ˈkei̯ljɔɡ / ˈkei̯ljɔɡ] = cock(erel); plucky person; weather-cock; cock of gun; water-cock; clevis of a plough, plough-cock; snack taken by quarrymen to their work
Old Cornish chelioc = cockerel, rooster
Middle Cornish kullyek = cockerel, rooster
Cornish (Kernewek) kulyek = cockerel, rooster
Middle Breton kilhog = cockerel, rooster
Breton (Brezhoneg) kilhog [ˈkiljok] = cockerel, rooster

Etymology: from the Proto-Indo-European *kerkos [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, MacBain’s Dictionary, In Dúil Bélrai English – Old-Irish Glossary, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Hens & Chickens

Words for hen, chicken and related things in Celtic languages:

Hens

Proto-Celtic *kerkā = hen
Old Irish (Goídelc) cerc [kʲerk] = hen, female bird
Middle Irish (Gaoidhealg) cerc [kʲerk] = hen, female bird
Irish (Gaeilge) cearc [kaɾˠk] = hen, female bird
cearcach = gallinaceous (relating to, or resembling the domestic fowl)
Scottish Gaelic (Gàidhlig) cearc [kʲɛrxg] = hen, chicken; poultry; female crab or lobster
cearc-uisge = moorhen
cearc-Fhrangach = turkey
cearc-fhraoich = female red grouse, moorhen
cearcach = of, or belonging to a hen or hens
Manx (Gaelg) kiark = fowl, hen, hen bird, female bird
kiark

Etymology: from the Proto-Indo-European *ḱer- (to grow, nourish) [source]. These words are possibly related to words for heron and crane in Celtic languages.

English words from the same root include cereal, create, increase, creature, crew and crescent [source].

Proto-Celtic *yarā = chicken
Gaulish Iaros = personal name
Old Irish (Goídelc) eirín = pullet, young hen
Middle Irish (Gaoidhealg) eréne, éirín(e) = chicken, chick, pullet
Irish (Gaeilge) eireog = pullet, chicken; young girl, tiny woman
Scottish Gaelic (Gàidhlig) eireag [erʲag] = pullet, young chick(en) (between 8 months and 1 year old)
Manx (Gaelg) earrag = pullet, poult
Old Welsh iar = hen
Middle Welsh (Kymraec) yar = hen
yeyr, yeir = domestic fowls, chickens
yares = flock of chichens
ieirdy = hen-house, hen-coop
Welsh (Cymraeg) iâr [jaːr] = hen, hen-bird
ieir = domestic fowls, chickens
iarbren = perch for hens, hen-roost
iardy, ieirdy = hen-house, hen-coop
iares = flock of chichens
iargyw = chichen, young fowl
ieirwr = poulterer
Middle Cornish (Cernewec) iar, yar = hen, female bird
Cornish (Kernewek) yar = chicken, hen
yar frankres = free-range hen
yar gowellys = battery hen
yar Gyni = turkey
bregh/brygh yar = chicken pox
yarji = chichen coop, hen house
Middle Breton (Brezonec) yar, iar = chicken, hen
Breton (Brezhoneg) yar = chicken, hen

Etymology: unknown

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

Ants

Words for ant and related things in Celtic languages.

Formica cf. rufibarbis

Words marked with a * are reconstructions.

Old Irish (Goídelc) sengán = ant
Middle Irish (Gaoidhealg) sengán, seangan = ant
Irish (Gaeilge) seangán = ant
seangánach = full of ants
nead seangán = anthill
Scottish Gaelic (Gàidhlig) seangan [ʃɛŋgan] = ant, mean fellow
seangan ‘nad bhriogais = to be fidgety, have the jtters (ants in your breeches)
seangananach [ʃɛŋganəx] = pertaining to or abounding in small ants
Manx (Gaelg) sniengan = ant
snienganagh = ant-infested, formic
crongan sniengan = anthill

Etymology: possibly from the Old Irish seng (thin, slender. meagre) [source].

Proto-Celtic *morwis = ant
Old Irish (Goídelc) moirb [morʲvʲ] = ant
Middle Irish (Gaoidhealg) moirb = ant
Middle Welsh (Kymraec) myr = ant
myrion = ants
morgrug, morcrug = ants
morgrugyn, morcrugyon = ant
Welsh (Cymraeg) mŷr, myrr [mɨːr/miːr] = ant
myrion = ants
myrdwyn = anthill
morgrug [ˈmɔrɡrɨ̞ɡ / ˈmɔrɡrɪɡ] = ants (from mŷr [ant] and crug [hill])
morgrugyn = ant
morgrugaidd, morgrugol = ant-like pertaining to ants, formic
Old Cornish menƿionen = ant
Middle Cornish (Cernewec) menwionen, meuwionen = ant, emmet
Cornish (Kernewek) moryonen = ant, tourists
moryoner = anteater
Old Breton moriuon = ant
Middle Breton (Brezonec) meryen = ant
Breton (Brezhoneg) merien [ˈmɛr.jɛn] = ants
merionenn = ant
merionaer = anteater
merieneg [mɛ.ˈrjẽː.nɛk] = anthill

Etymology: from the Proto-Indo-European *morwi- (ant). Words from the same roots include formic (pertaining to ants) and pismire (ant – archaic) in English, fourmi (ant) in French, mier (ant) in Dutch, maur (ant) in Icelandic and myra (ant) in Swedish [source].

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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, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Mice

Words for mice in Celtic languages.

Proto-Celtic *lukoss = mouse
Old Irish (Goídelc) luch [l͈ux] = mouse, rat
Irish (Gaeilge) luch [l̪ˠʊx / l̪ˠɔx / l̪ˠʌx] = mouse
luchóg = mouse
Scottish Gaelic (Gàidhlig) luch [l̪ˠux] = mouse
Manx (Gaelg) lugh [ɫɔx] = mouse
Proto-Brythonic *llug = mouse
*llugod = mice
Middle Welsh (Kymraec) lleyc = shrew, shrewmouse, (field) mouse
Welsh (Cymraeg) llyg = shrew, shrewmouse, (field) mouse
llygod [ˈɬəɡɔd] = mice, rats, shrews, voles
llygoden = mouse, rat, shrew, vole
Middle Cornish logoden, logosan = mouse
Cornish (Kernewek) logos = mice
logosen / logojen = mouse
Old Breton loc = mouse
Breton (Brezhoneg) logod = mice, yarn balls, meatballs, varicose veins
logodenn = mouse

Etymology: unknown, most likely from a non-Indo-European substrate language – only found in Celtic languages [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, MacBain’s Dictionary, In Dúil Bélrai English – Old-Irish Glossary, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Here’s a tune I wrote called The Field Mouse’s Delight / Llawenydd Llygoden y Coed:

Wood mice

Deer

Words for deer in Celtic languages. There were several different words for deer in Proto-Celtic: *wēdus, *karwos, *ellan(t)ī-, *danī- and *yorkos, and also *sidos (stag). They may have referred to different types of deer, but it is not certain which types, apart from *yorkos, which is a roe deer.

Deer

Proto-Celtic *wēdus [ˈweː.dus] = wild
Old Irish (Goídelc) fíad [fʲiːa̯ð] = wild animals, game, especially deer
Irish (Gaeilge) fia [fʲiə] = deer
Scottish Gaelic (Gàidhlig) fiadh [fiəɣ] = deer
Manx (Gaelg) feeaih = deer

Etymology: from the Proto-Indo-European *weydʰ- (wood, wilderness) [source].

Proto-Celtic *karwos = deer, stag
Gaulish caruus / carvos = deer
Old Irish (Goídelc) carbh = deer
Irish (Gaeilge) carria / cairrfhiadh = deer, stag
Scottish Gaelic (Gàidhlig) cair-fhiadh / carbh-fheadh = hart, stag
Manx (Gaelg) çharroo = stag
Proto-Brythonic *karw = deer, stag
Old Welsh *caru = deer
Middle Welsh (kymraec) caru, carv, carw = deer, hart, stag
Welsh (Cymraeg) carw [ˈkaru / ˈkaːru] = deer, hart, stag; lord, nobleman, patron
Old Cornish caruu = stag
Middle Cornish carow = stag
Cornish (Kernewek) karow = stag
Middle Breton caro, qaro = deer
Breton (Brezhoneg) karv = deer

Etymology: from the Proto-Indo-European *ḱerh₂wós, from *ḱerh₂- (horn) [source].

Proto-Celtic *sidos = stag
Old Irish (Goídelc) séd = deer
Welsh (Cymraeg) hydd = stag, hart
Breton (Brezhoneg) heizes = roe-deer, venison, intrepid boy

Etymology: uncertain

Proto-Celtic *ellan(t)ī- / *agliones = deer
Old Irish (Goídelc) ag [aɣ] = bullock, cow, ox; deer, stag
Irish (Gaeilge) agh = cow, ox
agh alla = deer
Scottish Gaelic (Gàidhlig) agh [ɤɣ] = heifer, hind
Welsh (Cymraeg) eilon/eilion = stag, hart

Etymology: possible from the same root as the English word eland (a type of antelope found in South Africa), which from the Dutch eland (elk), from the Old High German elent.

Proto-Celtic *ou̯ījkā = ?
Gaulish cerua = ?
Old Cornish euhic = hind, deer
Old Welsh eguic = hind, deer
Welsh (Cymraeg) ewig = hind, doe, roe; graceful light-footed woman; deer, hart

Etymology: possibly from the Proto-Indo-European *h₂ówis (sheep) [source]

Proto-Celtic *yorkos = roebuck, deer
Gaulish iorkos = deer
Proto-Brythonic *jorx = deer, stag
Welsh (Cymraeg) iwrch [jʊrχ] = roe-deer, roebuck
Old Cornish yorch = roe-deer
Cornish (Kernewek) yorgh = roe-deer
Old Breton iorch = roe-deer
Breton (Brezhoneg) yourc’h = roe-deer, venison, intrepid boy

Etymology: from the Proto-Indo-European *york- (antelope, gazelle) [source].

Proto-Celtic *danī- = deer
Welsh (Cymraeg) danas = deer, fallow deer
Breton (Brezhoneg) demm = deer, fallow deer

Etymology: related to the French daim (hind, doe), from the Latin dāma (fallow deer, buck, doe) [source]

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, MacBain’s Dictionary, In Dúil Bélrai English – Old-Irish Glossary, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau