Meaning A boy's name of Celtic origin, it means "Mythical Ulster chieftain." Origin of Conall Cernach Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Conall Cernach Similar Names Conal Cradawg Oscon Kenrick Cooey Cuanaic Caswallan Celyddon Coalan Conant Year by Year Popularity of Conall Cernach