Cognomen Trongtiang (Trongtiang 
) , globally, is a very rare last name. The family name Trongtiang is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Trongtiang | Thailand |
Paitoon, Voramet, Suphanut, Arissarapa, and Thanyaporn