Meaning A boy's name of Celtic origin, it means "Mythical." Origin of Gwernaeh Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gwernaeh Similar Names Nisien Glifieu Gruddieu Gwynham Connla Lir Cachamwri Culain Custennin Yspaddaden Year by Year Popularity of Gwernaeh