Surname ธำรงชัย (Thamrongchai 
, Tamrongchai , Thomrongchai ) , in the world, is an extremely rare cognomen. Much more frequently, ธำรงชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thomrongchai, Tamrongchai, Thamrongchai | Thailand |