Pronounced Pron. CASS-see [key]
Other Forms FormsO Cathasaigh, Casey, MacCasey, O'Casey, Caissey, Caussey
This surname originated around ancient Scotland and Ireland. In its Gaelic form it is called, 'O Cathasaigh', which means 'the watchful one'.927 people have this surname, and is most prevalent in the United States.