Last week I learnt that a butterfly in Cornish is a tykki Duw [tɪkˑi’dyˑʊ / tɪkˑi’diˑʊ], or literally “God’s pretty thing”. A moth is a tykki Duw nos or “God’s pretty thing of the night”).

The word tykki comes from teg (pretty, attractive), and Duw comes from the Proto-Celtic *dēwos (god), from the Proto-Indo-European *deywós (god), from *dyew- (sky, heaven).

Names for butterflies are interesting in other languages as well:

• Welsh: glöyn byw (glowing ember); iâr fach yr haf (little hen of the summer); pili-pala; plufyn bach yr haf (little feather of the summer), colomen fyw (lively pigeon); glöyn Duw (god’s ember/coal); eilir (spring).
• Scottish Gaelic: féileagan; dealan-dé (god’s lightning); sglapaid; teine-dé (god’s fire); teillean-dé (god’s bee); tormachan-dé (god’s ptarmigan); dealman-dé; strainnsear (stranger); gogag
• Manx: foillycan, follican
• Irish: féileacán; guagóg; uallán
• Breton: balafenn; barbellig; bobelan; aelig
• Swedish: fjäril
• Danish: sommerfugl (summer bird)
• Spanish: mariposa
• German: Schmetterling
• French: papillon
• Italian: farfalla
• Russian: бабочка (babochka)

What about in other languages?

Sources: Gerlyver Kernewek, Wiktionary, Geiriadur Prifysgol Cymru, Geiriadur yr Academi, Am Faclair Beag On-line Manx Dictionary, Dictionnaire Favereau, bab.la