Casy \c(a)-sy\ as a girl's name is a variant of Casey (Irish, Gaelic) and Cassie (English), and the meaning of Casy is "alert, watchful".

The baby name Casy sounds like Cassy, Cass, Casi, Cascy, Cacy, Cas and Kasy. Other similar baby names are Cady, Cary, Cay and Caty.