Family name Yamaoka (Yamaoka 
, 山岡 , Ямаока 
) , all over the world, is quite a rare last name. The surname Yamaoka is characteristic of Japan, where it is a rare surname, Brazil, and Canada. Not in comparison with a country's population, it is the most numerous in Brazil, Japan, and the United States. Much less frequently, Yamaoka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Yamaoka | Japan, China, United States, Canada, Brazil |
| 山岡 | China |
| Ямаока | Russia |
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yamaoka kagetaka samurai (b. 1526) |
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| yamaoka matsuake Japanese Kokugaku scholar (b. 1726) |
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| yamaoka geppo (Japanese, 1760–1839) (b. 1760) |
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| yamaoka beika Japanese artist (b. 1868) |
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| nozomu yamaoka (b. 1892) |
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| george yamaoka American lawyer, US (b. 1903) |
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| otto yamaoka American actor (b. 1904) |
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| ernie yamaoka Japanese-Canadian artist, CA (b. 1905) |
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| carrie yamaoka American artist, US (b. 1958) |
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| hideo yamaoka (b. 1958) |
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| yui yamaoka researcher |
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| toshimitsu yamaoka researcher |
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| kenji yamaoka researcher |
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| masakazu yamaoka researcher |
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| ryohei yamaoka researcher |
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