Cognomen Erusam (Erusam 
) , in the entire world, is a very rare surname. The surname Erusam is characteristic of Malaysia, where it is a very rare surname, and India, where it is an extremely rare surname. Very seldom, Erusam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Erusam | Malaysia, India |
Silvarajah, and Ravivarman