Cailyn \ca(il)-yn\ as a girl's name is a variant of Cailin (Gaelic) and Caitlin (Old French, Greek), and the meaning of Cailyn is "girl; pure".

The baby name Cailyn sounds like Caelyn, Caylyn, Calyn, Cailynn, Cailen and Kailyn. Other similar baby names are Catlyn, Caitlyn, Carlyn and Carilyn.