Cognomen Ruengsit (Ruengsit 
) , all around the world, is a very rare family name. The family name Ruengsit is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Ruengsit is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ruengsit | Thailand |