https://en.wikipedia.org/wiki/MacCarthy_Mor_dynasty
MacCarthy (Irish: Mac Cárthaigh), also spelled Macarthy, McCarthy or McCarty, is an Irish clan originating from Munster, an area they ruled during the Middle Ages.It was divided into several great branches; the MacCarthy Reagh, MacCarthy of Muskerry, and MacCarthy of Duhallow dynasties were the three most important of these.. Their name, meaning "son of Cárthach" …