Family name Kokubun (Kokubun 
, 国分 , Кокубун) , worldwide, is a rare cognomen. The surname Kokubun is characteristic of Japan, where it is a very rare surname, Peru, and the United States. Not in comparison with a country's population, it is commonest in the United States, Japan, and Brazil. Also, Kokubun is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kokubun | Peru, Brazil, United States, Japan, China |
| 国分 | China |
| kokubun tanemitsu (b. 1241) |
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| kokubun moritsuna (b. 1438) |
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| russell s. kokubun American politician, US (b. 1948) |
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| keisuke kokubun researcher |
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| mika kokubun researcher |
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| tetsuo kokubun researcher |
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| motohide kokubun researcher ORCID ID = 0000-0003-3529-3029 |
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| eduardo kokubun researcher |
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| taiki kokubun researcher (ORCID 0000-0003-2743-9550) |
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| yasuo kokubun researcher |
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| takanori kokubun researcher |
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| kokubun moriyuki |
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