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Cognomen Shiroyama (城山 , Shiroyama ) , throughout the world, is a rare surname. The cognomen Shiroyama is characteristic of Czechia, where it is a rare surname, New Zealand, where it is a very rare surname, and Japan. Measured by absolute frequency, it most frequently occurs in China, the United States, and Japan. Also, Shiroyama is the forename as well as the last name.