MacCarthy MacCarthy MacCarthy (Irish: Mac Cárthaigh), also spelled Macarthy, McCarthy or McCarty, is a Gaelic Irish clan originating from Munster, an area they ruled during the Middle Ages. It was and continues to be divided into several great branches. The MacCarthy Reagh, MacCarthy of Muskerry, and MacCarthy of Duhallow dynasties were the three most important of these, after the central or MacCarthy Mór line. Their name, meaning "son of Cárthach" (whose name meant "loving"), is a common surname that originated in Ireland. As a surname, its prevalent spelling in the English language is McCarthy. Several variants are found, such as McCarty
Poland (surname) the examples where the 'Mac' or 'Mc' has been dropped can be explained for several reasons. In English controlled areas of Ireland (especially around The Pale), it was declared that the Irish take on names in an English form and many were required to do so in order to do business with the powers that be, or to obtain a tenancy on English controlled land. Census takers were also allowed to use either form, with or without the Gaelic prefix. It also was not uncommon for the 'Mac' or 'Mc' prefix to simply be incorporated into the surname to result