Girl name origins & meanings Irish : Curly headed; clever Celtic, Gaelic : Clever Girl name variations Cassady Cassidey Kassadey Kassidy Kassodey Cassir Kasadee Kassydi Family name origins & meanings Irish (Fermanagh) : reduced Anglicized form of Gaelic Ó Caiside ‘descendant of Caiside’, a byname from cas ‘curly(-headed)’. Famous people with this last name David Cassidy Famous people who gave their babies this name Frank Gifford Kathie Lee Gifford