Cognomen Ratruethai (Ratruethai 
) , across the world, is a very rare surname. The surname Ratruethai is habitual in South-eastern Asia, particularly Malaysia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Very seldom, Ratruethai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratruethai | Thailand, Malaysia |