Surname Ruengsanajin (Ruengsanajin 
) , across the world, is a very rare last name. The surname Ruengsanajin is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruengsanajin | Thailand |
Rung, Ruug, and Achariyaporn