Surname Hirooka (Hirooka 
) , in the entire world, is a rare cognomen. The surname Hirooka is characteristic of Singapore, where it is a rare surname, New Zealand, and Japan, where it is a very rare surname. Measured by absolute frequency, the name is most common in Brazil, Japan, and the United States. Likewise, Hirooka is the forename as well as the last name.
| yoshio hirooka Japanese music teacher (b. 1898) |
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| yoshitaka hirooka researcher |
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| yoshiki hirooka researcher |
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| mutsuki hirooka Japanese association football player |
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| kazunobu hirooka researcher |
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| hiroyuki hirooka researcher (ORCID 0000-0002-9169-2908) |
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| suzana hirooka Hirooka, Suzana |
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| masashi hirooka researcher (ORCID 0000-0001-5634-5313) |
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| yasuo hirooka researcher ORCID ID = 0000-0001-8574-5762 |
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| nobuaki hirooka Peerage person ID=642225 |
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| kayo hirooka researcher |
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| nobutaka hirooka researcher (ORCID 0000-0002-0578-3572) |
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| kazutake hirooka researcher |
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| kazuyuki hirooka researcher |
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| yukiko hirooka Peerage person ID=642224 |
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