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English Scottish and northern Irish (of Norman origin): habitational name from Sainte-Foy-de-Montgomery and Saint-Germain-de-Montgomery (Calvados). In Ireland this surname was present in the medieval period died out and was then reintroduced from Scotland in the 17th century. It has been Gaelicized in Ireland as Mac Iomaire and in Scotland as Mac Gumaraid.
Source: Dictionary of American Family Names 2nd edition, 2022