Words for fire in Celtic languages.

Proto-Celtic	*teɸnets = fire
Old Irish (Goídelc)	teine [ˈtʲenʲe] = fire
Irish (Gaeilge)	tine [ˈtʲɪnʲə] = fire, conflagration; incandescence, flame; luminosity, glow; flash; inflammation
Scottish Gaelic (Gàidhlig)	teine [tʲenə] = fire, flame, conflagration
Manx (Gaelg)	çhenney = elemental fire, lightning, rickets
Middle Welsh (Kymraec)	tan [taːn] = fire
Welsh (Cymraeg)	tân [taːn] = fire, conflagration, bonfire, flame, spark, light (for a cigarette), match; high temperature (from fever)
Cornish (Kernewek)	tan [ta:n / tæ:n] = fire
Breton (Brezhoneg)	tan [ˈtɑ̃ːn] = fire

Etymology: from the Proto-Indo-European *tep- (to be warm) [source].

Old Irish (Goídelc)	aingel [ˈaŋʲɡʲel] = angel
Irish (Gaeilge)	aingeal [ˈæɲɟəl] = angel; fire, lighted coal
Scottish Gaelic (Gàidhlig)	aingeal [ˈãĩŋʲgʲəl̪ˠ] = angel, messenger, fire, light, sunshine; brightness, light; signal fire, beacon; warmth
Manx (Gaelg)	aile [ail] = fire ainle = angel
Welsh (Cymraeg)	angel [ˈaŋɛl] = angel
Cornish (Kernewek)	eledh = angel
Breton (Brezhoneg)	ael = angel

Etymology: from the Late Latin angelus (angel, messenger), from the Ancient Greek ἄγγελος (ángelos – messenger) [source].

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau