Cognomen Oohara (Oohara 
) , all around the world, is a rare family name. The surname Oohara is habitual in Taiwan, where it is a rare surname, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Oohara | Canada, Taiwan |
| k. oohara researcher, ORCID iD = 0000-0002-7518-6677 |
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| ken-ichi oohara researcher |
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| kenichi oohara researcher |
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| taka-aki oohara |
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