
English (London): of Norman origin a habitational name from Saint-Maur-des-Fossés (Seine) and possibly also from Saint-Maur-des-Bois (Manche) and Saint-Maur-sur-Loire (Touraine) named from the dedication of their churches to Saint Maur (see Moore ). In some cases also an Americanized form of French Canadian Cinq-Mars or of its original French form Saint-Mars.
Source: Dictionary of American Family Names 2nd edition, 2022