Surname ธรรมชัยกุล (Thammachai 
, ธรรมชัยกุล , Tamchaikul ) , all around the world, is a rare family name. The last name ธรรมชัยกุล is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, and Malaysia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thammachai | Malaysia, Thailand |
| Tamchaikul, Tharlhachaikool, ธรรมชัยกุล | Thailand |
Thamchaikul, Thammachaikul, Thammachaikun, Thammajaikul, Thummachaikun, and Tummachaikul