Meaning Gwenyth means white, pure, and fair. Origin of Gwenyth Welsh Popular Middle Names Grace, Louise, Mae, Rose Pronunciation 🔊 Listen Gwenyth GWEN-ith Similar Names Rhonwen Rhona Glenys Glynnis Guenevere Gwendelyn Gwendolyn Glenis Glynda Gwendi Year by Year Popularity of Gwenyth