Casey, O'Casey and MacCasey come from the Irish cathasach
meaning vigilant in war, a personal name which is quite common in
early Ireland. This no doubt accounts for the fact that O'Cathasaigh
arose as a separate surname in at least five distinct areas in
countries Cork, Dublin, Fermanagh, Limerick and Mayo with Mac
Cathasaigh confined to the Louth/Monaghen area. In Medieval
times the Dublin and Fermanagh Caseys were the greatest and most
prominent though their power like that of other families had been
broken by the seventeenth century. The name is still common in north
Connacht generally. However, most present day bearers of the surname
are to be found in Munster and not only Cork and Limerick but also
in Kerry and Tipperary.
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