Meaning A boy's name of Welsh origin, it means "Legendary son of Don Origin of Gilvaethwy Welsh +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gilvaethwy Similar Names Powell Gleis Gormant Granwen Gruddyeu Gusg Gwallawg Gweir Gwydre Gwyngad Year by Year Popularity of Gilvaethwy