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Cognomen Oko (Oko , Ооко) , in the entire world, is a widespread surname. The surname Oko is habitual in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a common surname, Equatorial Guinea, where it is quite a common surname, and Nigeria (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, Nigeria, and Ghana. Very seldom, Oko is the forename as well as the last name.