Last name Roisom (Roisom 
) , around the world, is a very rare cognomen. The family name Roisom is habitual in Thailand, where it is a very rare surname, the United States, where it is an extremely rare surname, and India. Very seldom, Roisom is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Roisom | India, United States, Thailand |