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