O'Donnell is a surname of Irish origin, commonly associated with the Gaelic name Ó Domhnaill, meaning "descendant of Domhnall." The name has historical significance in Ireland, particularly linked to the O'Donnell dynasty, which ruled parts of Ulster in the 15th and 16th centuries. In modern contexts, O'Donnell can refer to various individuals, including politicians, athletes, and entertainers. Notable figures include Megan O'Donnell, a prominent journalist, and Michael O'Donnell, a well-known author. The name is also used in place names and businesses, reflecting its widespread recognition.