In the entire world, 山口 (山口 
) is a very rare boy's first name. The first name 山口 is habitual in Eastern Asia, particularly China, where it is an extremely rare male name. Likewise, 山口 is the last name as well as the forename.
| VARIANT | COUNTRY |
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| 山口 | Japan, China |
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山口 忠五郎 JP (b. 1882) |
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山口 シヅエ Japanese politician (1917-2012), JP (b. 1917) |
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| 山口 興一 Japanese businessman, JP (b. 1909) |
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| 山口修 Japanese historian (1924-1998), JP (b. 1924) |
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山口 蛍 Japanese association football player (1990-), JP (b. 1990) |
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| 山口はるみ Japanese illustrator, JP (b. 1941) |
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| 山口マサル Japanese illustrator, JP (b. 1942) |
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| 山口 学 Japanese businessman, JP (b. 1946) |
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| 山口隆 Japanese architect, JP (b. 1953) |
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| 山口 剛 Japanese actor, JP (b. 1965) |
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| 山口 祐佳 Japanese announcer, JP (b. 1978) |
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| 山口ナオミ Japanese AV idol, JP (b. 1978) |
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| 山口武士 Japanese association football player, JP (b. 1979) |
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| 山口 孝男 mathematician specialised in differential geometry, JP |
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| 山口 孝志 JP (b. 1971) |
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