Casey is a given name, derived either from the Irish Gaelic cathasaigh, meaning vigilant or watchful, or from a combination of the initials K.C. It is in use for both boys and girls in the United States.
The different meanings of the name Casie are: American meaning: From Cayce. Celtic - Gaelic meaning: Descendant of Cathasach. Greek meaning: Pet form of Cassandra.
Cassey as a girls' name is of English and Greek derivation, and the meaning of the name Cassey is "alert, watchful; pure". Cassey is a variant form of Casey (Irish, Gaelic): from the male Gaelic name Cathasaigh. Cassey is also a form of Cassie (English).
The name Cassie is an English baby name. In English the meaning of the name Cassie is: Unheeded prophetess. A , Cassandra, or Catherine. Cassandra was a Trojan prophetess, daughter of King Priam. In Homer's 'The Iliad' Cassandra's prediction of the fall of Troy was unheeded.
