Last name ทองจันทร์ (ทองจันทร์ 
, Thongchan 
, Thongjan 
) , globally, is quite a common surname. The last name ทองจันทร์ is habitual in South-eastern Asia, particularly Thailand, where it is quite a common surname. Likewise, ทองจันทร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ทองจันทร์ | Thailand |
| Thongchan | Laos, India, United States, Thailand |
| Thongjan | United States, Thailand, Japan |
| Tongchan | United States, Thailand, China |
Thong Chan, Thongchans, Thongchantr, Thongechan, Thongjanhard, Thonkchan, and Tongchansa