Family History and Genealogy Resources by Surname
O'Donnell Surname OriginThe 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.
O'Donnell Surname Meaning and Family Facts
There is more to O'Donnell family history than the origin of your surname:
A O'Donnell Family History Thought:
'Every man is his own ancestor, and every man his own heir. He devises his own future, and he inherits his own past.' -- H. F. Hedge