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Family name Tokuyama (德山 , Tokuyama , 徳山 ) , throughout the world, is quite a common cognomen. The cognomen Tokuyama is characteristic of China, where it is a rare surname, Japan, and Canada, where it is a very rare surname. Measured by absolute frequency, it is commonest in China, Japan, and the United States. More frequently, Tokuyama is the forename as well as the last name.