Family name Hirotomi (Hirotomi 
) , throughout the world, is a very rare cognomen. The last name Hirotomi is habitual in Brazil, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Much more frequently, Hirotomi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hirotomi | Japan, United Kingdom, Brazil, Peru, United States |