O'Neill: In addition to the famous O'Neills of Ulster there were septs of the name in thomond (see Nihil), Decies(Co. Waterford) and Carlow. The main family of O'Neills, dominant in Tyrone up to the collapse of the Gaelic system in the seventeenth century, descend from the famous Niall of the Nine Hostages. A branch Knowan as Clandeboy (clann Aoidh Bhuidhe) setteled in Co, Antrim in the fourteenth century. The name is numerous throughout Ireland especially in Tyrone and Antrim.