Surname Yamaguchi (ヤマグチ 
, Yamaguchi 
, Ямагути 
, among others...) , around the globe, is a common family name. The cognomen Yamaguchi is habitual in British Virgin Islands, where it is quite a common surname, Bahamas, where it is quite a rare surname, and Japan. Measured by absolute frequency, it is the most numerous in Japan, Brazil, and the United States. More prevalently, Yamaguchi is the forename as well as the last name.
| yamaguchi takakiyo samurai (b. 1350) |
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| naokatsu yamaguchi (b. 1777) |
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| yamaguchi koichi (b. 1841) |
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fumiko yamaguchi physician and advocate for reproductive health, JP (b. 1903) |
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| yamaguchi hiroyoshi (b. 1860) |
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| kokichi yamaguchi Japanese architect (b. 1873) |
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| yamaguchi satsujo Chinese philosopher in Japan (b. 1882) |
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| sueichi yamaguchi (b. 1894) |
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nise yamaguchi researcher, Brazilian physician, BR (b. 1959) |
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| hatsuye yamaguchi US (b. 1911) |
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kristi yamaguchi American figure skater, US (b. 1971) |
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| zenzō yamaguchi (b. 1913) |
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| toshikazu yamaguchi Japanese accounting academic (b. 1923) |
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| masaji yamaguchi person identified in the Museu da Pessoa collection, JP (b. 1923) |
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| katsuo yamaguchi (b. 1917) |
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