Meaning A boy's name of Celtic origin, it means "Mythical son of Medredydd." Origin of Medredydd Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Medredydd Similar Names Nisien Powell Connla Setanta Aod Cradawg Efnisien Ferehar Glifieu Sugn Year by Year Popularity of Medredydd