Meaning A girl's name of Latin origin, it means "downy-haired." Origin of Gillian Latin +-100%Zoom level changed to 1 Popular Middle Names Amara, Ann, Ellie, Gianna, Kate, Marie Pronunciation 🔊 Listen Gillian GILL-ee-an Similar Names Julia Julianne Lianne Laney Lanie Griselda Griselle Grisella Gryselda Grizelda Year by Year Popularity of Gillian