O'Neil Surname Origin
The descendants of Neil, that is, the powerful or mighty.
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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O'Neil Last Name Meaning
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O'Neil at the Mormon LDS Database
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O'Neil at RootsWeb databases
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O'Neil in Ancestry Message Boards
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O'Neil in Ancestry Family Histories
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O'Neil Self-Published Genealogy Books
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