Cognomen Rumau (Rumau 
) , worldwide, is a rare surname. The family name Rumau is characteristic of Indonesia, where it is a very rare surname, Greece, and Malaysia, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Indonesia, Greece, and France. Much less frequently, Rumau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rumau | Indonesia, Nigeria, India, Greece, France |