Surname Koyama (コヤマ 
, 小山 
, Koyama 
, among others...) , worldwide, is quite a common last name. The surname Koyama is habitual in Papua New Guinea, where it is quite a rare surname, Japan, and Singapore, where it is a rare surname. In absolute terms, it is commonest in China, Japan, and Brazil. More prevalently, Koyama is the forename as well as the last name.
| VARIANT | COUNTRY |
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| コヤマ | Japan |
| 小山 | China |
| Koyama | Brazil, United States, Japan, Papua New Guinea, China |
| Кояма | Russia |
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koyama zengen (b. 1827) |
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| adriana carvalho koyama person identified in the Museu da Pessoa collection, BR (b. 1862) |
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| mitsuo koyama botanist (1885-1935) (b. 1885) |
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| koyama eitatsu (b. 1880) |
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| sadatomo koyama (b. 1888) |
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| koyama taigetsu (b. 1891) |
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| ryōta koyama Japanese film actor, JP (b. 1901) |
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| takeo koyama Japanese politician (b. 1905) |
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| ryūtarō koyama (b. 1904) |
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shigeto koyama Japanese illustrator, JP (b. 1975) |
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| kōsuke koyama Japanese theologian (1929-2009), NZ (b. 1929) |
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| kanehiro koyama badminton player, JP (b. 1944) |
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| hiroshi koyama sculptor (b. 1955) |
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| shota koyama JP (b. 1947) |
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| eileen koyama Japanese-Canadian artist, CA (b. 1961) |
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