Keyllie \ke(yl)-lie\ as a girl's name is a variant of Keely (Gaelic), and the meaning of Keyllie is "slender, pretty".
The baby name Keyllie sounds like Kayllie, Keylie and Kellie. Other similar baby names are Kallie, Cellie, Nellie, Kaylie, Keylley, Keilie, Keelie, Kellbie, Kellye, Kelli, Kellee, Kelsie, Kellsie, Kelcie, Kylie, Mellie and Phyllie.