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Family name 小山 (小山 , Oyama , Koyama , and others...) , all over the world, is a common last name. The family name 小山 is characteristic of Gabon, where it is quite a rare surname, Papua New Guinea, and Nigeria. Measured by absolute frequency, it most frequently occurs in Nigeria, China, and Brazil. Likewise, 小山 is the forename as well as the last name.