Definition of "Cassidy"

A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.  examples

A surname from Irish, a rare anglicization of Mac Casarlaigh (Casserly).  examples

A male given name transferred from the surname.  examples

A female given name transferred from the surname, of modern American usage.  examples

A community in southern Vancouver Island, British Columbia, Canada.  examples