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Cognomen 南谷 (Nangu , 南谷 , Minamitani ) , in all the world, is quite a rare last name. The family name 南谷 is characteristic of Papua New Guinea, where it is quite a rare surname, Tanzania, and South Africa. Measured by absolute frequency, this name is the most popular in India, Tanzania, and South Africa. Also, 南谷 is the forename as well as the last name.