Surname Kaihara (Kaihara 
) , around the globe, is a rare last name. The last name Kaihara is habitual in Brazil, where it is a very rare surname, Argentina, and the United States. Very seldom, Kaihara is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaihara | Japan, China, United States, Argentina, Brazil |
| shigekoto kaihara (1937-2011) (b. 1937) |
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| toshiya kaihara researcher |
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