Surname ทองแปง (Thonglang 
, ทองแปง , Thongpain 
) , across the world, is a rare cognomen. The surname ทองแปง is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Also, ทองแปง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thonglang | Sweden, China, Thailand, India |
| ทองแปง | Thailand |
| Thongpain | United States, Thailand |