Surname Hamaoka (Hamaoka 
) , worldwide, is a rare cognomen. The surname Hamaoka is characteristic of Canada, where it is a very rare surname, Brazil, and Japan. In absolute terms, it is the most numerous in Brazil, the United States, and Japan. Very seldom, Hamaoka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hamaoka | Japan, Canada, China, Brazil, United States |
| t. hamaoka botanist |
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| hakushi hamaoka researcher |
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| norimitsu hamaoka researcher |
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| takafumi hamaoka researcher (ORCID 0000-0002-7470-5711) |
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| takuto hamaoka researcher |
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