Save Gender Masculine Usage Old Irish, Irish (Modern, Rare) Pronounced Pron. /ˈɛːj.nʲæ.xɑːn/(Irish) [key·simplify] Meaning & History Old Irish Gaelic name of unknown meaning. This was the name of the first chieftain of the O'Donnell clan. In modern times it has usually been reinterpreted as an Irish form of Ignatius.