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Family name Nanba (ナンバ , Nanba , Намба ) , all over the world, is a rare cognomen. The last name Nanba is characteristic of Japan, where it is a rare surname, Russia, where it is a very rare surname, and Georgia. Measured by absolute frequency, it is commonest in Japan, Russia, and Brazil. Predominantly, Nanba is the forename as well as the last name.