Words for man / husband in Celtic languages.

Proto-Celtic	*wiros = man, husband
Celtiberian	*uiros = man, husband
Gaulish	*wiros = man, husband
Primitive Irish	*ᚃᚔᚏᚐᚄ (*viras) [u̯irah] = man
Old Irish (Goídelc)	fer [fʲer] = man, husband
Irish (Gaeilge)	fear [fʲaɾˠ] = man, husband
Scottish Gaelic (Gàidhlig)	fear [fɛr] = man, husband, male
Manx (Gaelg)	fer [fɛr] = male, man, gentleman, individual, fellow, bloke, chap
Proto-Brythonic	*gwur [ˈˠwur] = man, husband
Old Welsh	gur = man, husband
Middle Welsh (Kymraec)	gur = man, husband
Welsh (Cymraeg)	gŵr [ɡuːr] = man, person, anyone, valiant warrior, brave man, hero; vassal; married man, husband; chessman, pawn
Old Cornish	uir = husband
Cornish (Kernewek)	gour [ɡu:r] = husband
Middle Breton	gur = man, husband
Breton (Brezhoneg)	gour [ˈɡuːʁ] = man, person, husband (rare)

Etymology
From the Proto-Indo-European *wiHrós (man, husband, warrior, hero) [source], which is also the root of the English words virile and werewolf.

Words marked with a * are reconstructions.

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