Family History and Genealogy Resources by Surname
McIldouney Surname Origin
(Origin Gaelic) From Mac, son, gille, a youth, and doinne, brownishness;--the son of the brown-haired youth.
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.
McIldouney Surname Meaning and Family Facts
There is more to McIldouney family history than the origin of your surname:
A McIldouney Family History Thought:
'If man cares not for his roots, then how can he care for his branches?' --Doyle M Davis