Meaning A girl's name of Celtic origin, it means "Blessed." Origin of Gwenneth Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Lynne Pronunciation 🔊 Listen Gwenneth Similar Names Gwendolen Gwenith Gwynith Bellicent Benedicta Arte Arlene Gwen Mariel Winnie Year by Year Popularity of Gwenneth