Fillis \f(il)-lis\ as a girl's name is a variant of Phyllis (Greek), and the meaning of Fillis is "greenery".
The baby name Fillis sounds like Filis, Fyllis and Fillys. Other similar baby names are Ailis, Allis, Collis, Dallis, Dellis, Dyllis, Dillys, Eilis, Felis, Filia, Hollis, Lillias, Lillas, Fillida, Fillira, Phillis and Wallis.