Dillys is not a popular first name for women and an equally uncommon surname or last name for both men and women. (1990 U.S. Census)
Dillys \d(i)-ll-ys\ as a girl's name is a variant of Dilys (Welsh), and the meaning of Dillys is "perfect; true, reliable". The baby name Dillys sounds like Dallas, Dallis, Dalles, Dellis and Dyllis. Other similar baby names are Fillys, Delly, Allys, Dilla, Dilli, Dolly, Dillon, Dillan, Lillas, Tilly, Fillis and Wallys.