Surname เพชรธำรงชัย (เพชรธำรงชัย, Pettumrongchai, Petchthumrongchai 
) , across the world, is an extremely rare last name. The last name เพชรธำรงชัย is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Petchthumrongchai | Thailand |