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Cognomen Mbaya (Mbaya ) , worldwide, is a common last name. The cognomen Mbaya is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is quite a common surname, Kenya, and the Republic of the Congo, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, Kenya, and Tanzania. Much less frequently, Mbaya is the forename as well as the last name.