Surname Iwahiro (Iwahiro 
) , around the world, is a rare family name. The last name Iwahiro is habitual in Japan, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, Iwahiro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iwahiro | United States, Japan |