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Family name Namba (ナンバ , Namba , Намба ) , throughout the world, is quite a rare surname. The family name Namba is characteristic of Papua New Guinea, where it is quite a rare surname, South Africa, and Cameroon. Measured by absolute frequency, it is commonest in South Africa, Brazil, and Papua New Guinea. More frequently, Namba is the forename as well as the last name.