Cognomen ヒロイチ (Hiroichi 
, ヒロイチ ) , across the world, is a rare surname. The surname ヒロイチ is habitual in Taiwan, where it is a rare surname, Japan, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Eastern Asia, particularly Japan, Taiwan, and China. More frequently, ヒロイチ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hiroichi | Japan, China, Taiwan, United States, Brazil |
| ヒロイチ | Japan |