Meaning A boy's name of Celtic origin, it means "Mythical father of Culhwch." Origin of Celyddon Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Celyddon Similar Names Clustfeinad Gwynham Mynogan Yspaddaden Nisien Abul Fazl Connla Cachamwri Cocidius Custennin Year by Year Popularity of Celyddon