The name O'Carroll / Carroll is derived from Cearbhaill, (Irish "Warrior Champion" or, more accurately rendered, "Slaughter"), and Son of Aedh, who was Chief of the Cianachta (The Clansmen) and King of Eile. Prince Cearbhaill led the Eilians for King Brian Boru at the Battle of Clontarf 1014. Since 1983, Eile F.J. O'Carroll, has become the recognized Chief of Name, and is a member on the Standing Council of Irish Chiefs and Chieftains. Modern Irish spelling may include Cearuil. (The "U" is accented or in Gaelic a Fada)