Family History and Genealogy Resources by Surname
McManus Surname Origin
The son of Manus or Magnus, the great, or renowned.
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.
McManus Surname Meaning and Family Facts
McManus Last Name Meaning
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There is more to McManus family history than the origin of your surname:
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A McManus Family History Thought:
Old Genealogists never die - they just lose their census.