The O'Donnell Clan is a prominent Irish family with roots in County Donegal, known for its historical significance in Ireland. The clan's name derives from the Gaelic "Ó Domhnaill," meaning "descendant of Domhnall." The O'Donnells were influential in the region during the Middle Ages, particularly as rulers of the Kingdom of Tyrconnell. The clan played a crucial role in Irish history, especially during the Nine Years' War against English rule in the late 16th century. Notable figures include Hugh O'Donnell, a key leader in the conflict, and Red Hugh O'Donnell, who became a symbol of resistance against English oppression.