Surname ตงฉิน (忠臣 
, Tongchin 
, ตงฉิน ) , globally, is quite a rare cognomen. The surname ตงฉิน is characteristic of China, where it is a rare surname, Thailand, and Nigeria, where it is an extremely rare surname. More prevalently, ตงฉิน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 忠臣 | China |
| Tongchin | Malaysia, Nigeria, United States, Thailand, India |
| ตงฉิน | Thailand |