Cassy \c(as)-sy\ as a girl's name is a variant of Acacia (Greek), Cass (Greek), Cassandra (Greek), Cassie (English) and Catherine (Greek), and the meaning of Cassy is "thorny tree; man's defender; man's defender, warrior; pure".

The baby name Cassy sounds like Kassy, Casey, Casy, Cassye, Cassey, Casse, Cascy and Cassi. Other similar baby names are Chassy and Cissy.