Lillas \l(il)-las\ as a girl's name is a variant of Lilias (Scottish). See for meaning of Lillas.
The baby name Lillas sounds like Lillias and Lilas. Other similar baby names are Lilla, Sileas, Lila, Dallas, Lilah, Dillys, Lalla, Lilia, Lilac, Lillian, Lilly, Lillie, Lillia, Lilli, Lilian, Lilley, Lolla, Pallas, Fillys and Fillis.