Family History and Genealogy Resources by Surname
McDuff Surname Origin
(Origin Gaelic) The son of the captain, from Mac, son, and Duff, a captain.
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.
McDuff Surname Meaning and Family Facts
There is more to McDuff family history than the origin of your surname:
A McDuff Family History Thought:
'If man cares not for his roots, then how can he care for his branches?' --Doyle M Davis