Cognomen Oinuma (Oinuma 
) , in all the world, is a very rare family name. The cognomen Oinuma is characteristic of the United States, where it is an extremely rare surname, and India. More frequently, Oinuma is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oinuma | India, China, United States |
| ryūzō oinuma Japanese polymer chemist (b. 1940) |
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| izumi oinuma researcher (ORCID 0000-0001-6398-5255) |
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| kazuhiro oinuma researcher |
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| kaori oinuma Filipina actress, JP |
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