O'Donnell Surname Origin
The descendants of Donal, an ancient Irish family, who trace their descent through Donal to Niallus Magnus, the ancestor of the O'Neills, known as Nial Niagallach, Nial of the nine hostages. The O'Donnells ruled the territory of Tirconnell, for thirteen generations. See Donald
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
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