Quick answer
Casey is a boy/girl name.
Meaning and history
This name comes from the Irish surname Casey, an Anglicized form of Ó Cathasaigh, a patronymic derived from the given name Cathassach. This name can be given in honour of Casey Jones (1863-1900), a train engineer who sacrificed his life to save his passengers. In his case, Casey was a nickname acquired because he was raised in the town of Cayce, Kentucky.
Notes and context
Usage: english