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Surname 上山 (Kamiyama , Ueyama , 上山 ) , across the world, is quite a rare cognomen. The cognomen 上山 is characteristic of Hong Kong, where it is a rare surname, Slovenia, and Singapore. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and the United States. Likewise, 上山 is the forename as well as the last name.