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