Family History and Genealogy Resources by Surname
Loudoun Surname Origin
From the parish of Loudoun in Ayrshire, Scotland. The name is compounded of Law and dun,--a pleonasm, as both words signify a hill. The hill-hill.
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.
Loudoun Surname Meaning and Family Facts
There is more to Loudoun family history than the origin of your surname:
A Loudoun Family History Thought:
'The only thing new in the world is the history you don't know.' --Harry S. Truman