MacCarthy is a surname of Irish origin, commonly associated with the Gaelic name Mac Carthaigh, meaning "son of Carthach." The name has historical significance in Ireland, particularly in the province of Munster, where the MacCarthy clan played a prominent role in local governance and culture. The MacCarthy family has produced several notable figures throughout history, including kings and nobles. One of the most famous branches is the MacCarthy Reagh, who were influential in the 16th century. Today, the name is still prevalent in Ireland and among the Irish diaspora worldwide.