Cognomen Rujajaruswong (Rujajaruswong 
) , in all the world, is a very rare last name. The cognomen Rujajaruswong is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname, and Malaysia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rujajaruswong | Malaysia, Thailand |