Meaning and name origin
Cassy \c(as)-sy\ as a girl's name is of Greek and English origin, and the meaning of Cassy is "thorny tree; man's defender; pure". Cassy is a variant of Acacia (Greek): name of the flower related to the mimosa. Also a variant of Cass (Greek): medieval and modern short form of Cassandra. Cassy is also used as a variant of Cassie (English) and Catherine (Greek).
Cassy is a somewhat popular first name for females (#3741 out of 4276, Top 87%) but an uncommon surname or last name for all people (2000 U.S. Census).
Displayed below is a comparison of the popularity of the girl name Cassy and its variant forms. Popular variation forms ranked in the Top 1000/100 are Catherine (#170), Cassandra (#516), Casey (#792), Cassie, Acacia, Kassie, Casie, Kacey and Kasey. (2014 statistics).
Cassy is also pronounced similarly to Cacey, Cacy, Caisey, Caisi, Cascy, Casee, Casi, Cassia, Cassye, Caysey, Caysi, Kaysy and Kessy. Other suggested similar baby names are Cas, Casha, Casia, Casse, Cayse, Chassey, Chassy, Chessy, Cissey, Cissi and Cissy. These names tend to be less commonly used than Cassy.