Family History and Genealogy Resources by Surname
Monroe Surname Origin
(Locality). Monadh Roe or Mont Roe, from the mount on the river Roe, in Ireland, whence the family came. Moine Roe, a mossy place on the Roe; M'unroe, from, of, or about the Roe. The river is sometimes written Munree.
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.
Monroe Surname Meaning and Family Facts
There is more to Monroe family history than the origin of your surname:
A Monroe Family History Thought:
'The past isn't dead. It isn't even past.' --William Faulkner