Family name Kumahara (Kumahara 
) , across the world, is a very rare cognomen. The surname Kumahara is habitual in New Zealand, where it is a very rare surname, Brazil, and Canada, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kumahara | New Zealand, Canada, Brazil, United States |
| hideaki kumahara researcher (ORCID 0000-0003-4223-8490) |
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| caroline kumahara table tennis player, BR (b. 1995) |
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Mr, Koichi, Kleber, Rafael, Robson, Regina, Toshio, Tokuya, Tsuneo, Harumi, Hiromi, Yukimi, Masaaki, Seiichi, Alberto, Charles, Claudia, Katsumi, Keisaku, Roberto, Gustavo, Tatsuya, Kazumi, Masami, Masako, Yasuo, Ko, Ana, Mayu, Alan, Akio, Chie, Caio, Koji, Luiz, John, Takashi, Erik, Mauro, Sadao, Seiji, Akira, Karen, Renan, Naomi, Erica, Emico, Vania, Masao, and Takeshi