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Last name Оку (奥 , Oku , Okou ) , all over the world, is a common cognomen. The last name Оку is habitual in Sub-Saharan Africa, particularly Ivory Coast, where it is quite a common surname, Ghana, where it is quite a rare surname, and Nigeria. In absolute terms, it is commonest in China, Nigeria, and Ivory Coast. Likewise, Оку is the forename as well as the last name.