Meaning A boy's name of Celtic origin, it means "From Arthurian legend." Origin of Gwalchmai Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gwalchmai Similar Names Cassivellaunus Caswallan Guiomar Perce Cian Fergus Annan Artek Atre Arto Year by Year Popularity of Gwalchmai