found: Work cat.: Ceneĺ Conaill and the Donegal kingdoms, AD 500-800, c2006:p. 29 (Uĺ Néill, lit. "descendants of Niall"; mythical origins of house from Niall Noígíallach (Niall of the Nine Hostages); southern branch based in counties of Meath and Westmeath; northern branch based in Derry, Tyrone, and Donegal, originated in Donegal in the 5th cent. CE)
found: Clans and families of Ireland, c1993:article O'Neill (Uĺ Néill, powerful tribal grouping claiming descent from Naill [sic] of the Nine Hostages, the 5th cent. monarch supposedly responsible for kidnapping St. Patrick to Ireland)
found: Encyclopedia Britannica Online, Nov. 8, 2006:article Northern Ireland>Early Ulster>Gaelic Irish and Anglo-Normans (c. 600-c. 1300) (By the 8th century Ulster was dominated by a dynasty called the U ̕Nǐll (O'Neill), which claimed descent from a shadowy figure of the 5th century known as Niall of the Nine Hostages. Divided into a northern and a southern branch, the U ̕Nǐll asserted hegemony as high kings, to whom all other Irish kings owed deference.)