Jillyan \j(i)-ll-yan\ as a girl's name is a variant of Gillian (Latin), Jill and Jillian, and the meaning of Jillyan is "youthful".

The baby name Jillyan sounds like Jillan, Gillan, Jyllian, Jilleen, Jillane, Jillana, Jilian, Jillyanne, Jillyanna, Jilliann, Jilliane and Jilliana. Other similar baby names are Lillyan and Lilyan.