Dyllis \d(yl)-lis\ as a girl's name is a variant of Dilys (Welsh), and the meaning of Dyllis is "perfect; true, reliable".
The baby name Dyllis sounds like Dallis, Dellis and Dylis. Other similar baby names are Fyllis, Delli, Allis, Collis, Dallas, Dalles, Dellise, Delis, Dilli, Dillys, Dollie, Dolli, Dyllan, Hollis, Phyllis, Fillis and Wallis.