Cognomen Koitabashi (Koitabashi 
) , in the entire world, is a very rare family name. The last name Koitabashi is characteristic of Peru, where it is a very rare surname, Philippines, where it is an extremely rare surname, and the United States. More prevalently, Koitabashi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koitabashi | Japan, China, Philippines, United States, Peru |
| kōsaku koitabashi (b. 1919) |
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| kikuyo koitabashi (b. 1952) |
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| motoo koitabashi researcher (ORCID 0000-0001-6260-2232) |
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| norimichi koitabashi researcher (ORCID 0000-0002-2113-3422) |
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| toshiya koitabashi researcher |
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| yusuke koitabashi researcher |
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