Cognomen Kahiro (Kahiro 
) , globally, is a rare last name. The family name Kahiro is habitual in Kenya, where it is quite a rare surname, Japan, where it is a very rare surname, and Malaysia. Also, Kahiro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kahiro | Japan, China, Malaysia, Kenya, Nigeria |