O'Brien Surname Origin
The descendant of Brien, i.e., exalted, noble.
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'Brien Last Name Meaning
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O'Brien at the Mormon LDS Database
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O'Brien at RootsWeb databases
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O'Brien Self-Published Genealogy Books
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