Family name Thengwanit (Thengwanit 
) , in all the world, is a very rare last name. The cognomen Thengwanit is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thengwanit | Thailand |
Latda, Akharadet, and Nuengruethai