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Surname Ngoy (Ngoy , نغوي ) , in the world, is a common cognomen. The last name Ngoy is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is quite a common surname, the Republic of the Congo, and Namibia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in the Democratic Republic of the Congo, the Republic of the Congo, and France. Very seldom, Ngoy is the forename as well as the last name.