Family name 山口 (山口 
) , in the entire world, is a rare cognomen. The last name 山口 is habitual in Eastern Asia, particularly Japan, where it is a very rare surname, and China, where it is an extremely rare surname. Likewise, 山口 is the forename as well as the last name.
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| 山口 | Japan, China |
| 山口雪渓 Japanese artist, JP (b. 1648) |
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| 山口重治 JP (b. 1661) |
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| 山口素絢 Japanese artist (1759-1818), JP (b. 1759) |
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山口尚芳 Japanese politician (1839-1894), JP (b. 1839) |
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山口素臣 Japanese military personnel, JP (b. 1846) |
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山口半六 Japanese architect, JP (b. 1858) |
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山口勝 Japanese military personnel (1862-1938), JP (b. 1862) |
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山口鋭之助 Japanese physicist and bureaucrat, JP (b. 1862) |
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山口 熊野 Japanese politician, JP (b. 1864) |
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山口 玄洞 JP (b. 1863) |
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山口十八 (1878-1937), JP (b. 1878) |
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| 山口直毅 Japanese government official and poet (1830-1895), JP (b. 1830) |
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山口龍之助 JP (b. 1874) |
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山口安憲 Japanese politician, JP (b. 1887) |
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山口政二 Japanese lawyer (1887-1927), JP (b. 1887) |
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