Cognomen Kumazaki (Kumazaki 
) , all around the world, is a rare surname. The cognomen Kumazaki is characteristic of Singapore, where it is a rare surname, Japan, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Japan, Brazil, and Singapore. Much less frequently, Kumazaki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kumazaki | Japan, China, Singapore, United States, Brazil |
| kenʼō kumazaki (b. 1882) |
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| kaoru kumazaki researcher |
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| hiromasa kumazaki researcher |
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| hirokazu kumazaki researcher |
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| m. kumazaki researcher |
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| makoto kumazaki researcher |
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