Cognomen Ohyama (Ohyama 
, Оояма, โอยามะ 
) , throughout the world, is a rare last name. The last name Ohyama is habitual in Japan, where it is a very rare surname, Argentina, and Thailand. Not in comparison with a country's population, it is the most numerous in Japan, the United States, and Argentina. Also, Ohyama is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ohyama | Japan, China, United States, Argentina, Brazil |
| โอยามะ | Thailand |
| yoshiro ohyama Peerage person ID=507912 |
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| shohei ohyama researcher (ORCID 0000-0003-3582-6390) |
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| kaname ohyama researcher (ORCID 0000-0002-1449-5505) |
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| yoshiaki ohyama researcher |
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| akio ohyama researcher |
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| takehiro ohyama researcher |
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| takahiro ohyama researcher |
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| junya ohyama researcher |
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| shigekazu ohyama researcher |
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| akihiro ohyama researcher |
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| michihiro ohyama Ph.D. University of Rochester 1972 |
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| junji ohyama researcher |
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| kenji ohyama researcher |
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| chikara ohyama researcher (ORCID 0000-0003-1550-8379) |
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| katsuhiro ohyama researcher |
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