Meaning A boy's name of Celtic origin, it means "Mythical son of Muriuel." Origin of Gruddieu Celtic , Irish Popular Middle Names Pronunciation Listen Similar Names Related posts: Genki Geoffrey Geroncio Gajendra Gregers Garritt Grigori Galaway Gaylen Gionnan Year by Year Popularity of Gruddieu Source: Social Security (SSA) Share this name: PinterestTwitterFacebookRedditEmailShare Save this name: Loading