Meaning A girl's name of Welsh origin, it means "White Fair Happiness Blessed Origin of Gwynneth Welsh +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gwynneth Similar Names Gwyn Rhonwen Rhona Gwynedd Gwendelyn Gwendoline Gwenna Gwynn Gwendi Gwyndolyn Year by Year Popularity of Gwynneth