Cassey \c(as)-sey\ as a girl's name is a variant of Casey (Irish, Gaelic), Cassie (English), Catherine (Greek) and Katherine (Greek), and the meaning of Cassey is "alert, watchful; pure".

The baby name Cassey sounds like Cassy, Caysey, Cassee, Casse, Caisey and Kassey. Other similar baby names are Chassey, Lassey and Cissey.