Last name 西山 (西山 
, Nishiyama 
) , across the world, is quite a rare cognomen. The family name 西山 is characteristic of Marshall Islands, where it is quite a common surname, Japan, where it is a rare surname, and Brazil. Not in comparison with a country's population, this name is the most popular in Brazil, Japan, and China. Also, 西山 is the forename as well as the last name.
| 西山千明 Japanese economist, JP (b. 1924) |
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| 西山 正行 JP (b. 1921) |
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| 西山 孝之 JP (b. 1925) |
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| 西山賢一 JP (b. 1943) |
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| 西山 裕之 JP (b. 1964) |
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| 西山彰 Japanese businessman and politician |
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