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Cognomen Niyama (นิยม , Niyama , 二山 ) , throughout the world, is quite a rare surname. The cognomen Niyama is characteristic of Thailand, where it is quite a rare surname, Belgium, where it is a very rare surname, and Brazil. Not in comparison with a country's population, it is commonest in Thailand, China, and Brazil. More prevalently, Niyama is the forename as well as the last name.