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Cognomen Wangu (Wangu ) , across the world, is quite a common family name. The surname Wangu is habitual in Kenya, where it is quite a common surname, Botswana, where it is quite a rare surname, and Papua New Guinea. Measured by absolute frequency, the name is most common in Kenya, Indonesia, and the Democratic Republic of the Congo. Much less frequently, Wangu is the forename as well as the last name.