Mac Carthaigh is a surname of Irish origin, meaning "son of Carthach." It is associated with a prominent Gaelic family that historically ruled parts of County Kerry in Ireland. The family played a significant role in the region's history, particularly during the medieval period. The Mac Carthaigh clan is known for its contributions to Irish culture and politics. They were involved in various conflicts and alliances, shaping the landscape of Irish history. Today, the name is still recognized in Ireland and among those of Irish descent worldwide.