Cognomen สว่างจันทร์ (สว่างจันทร์, Sawangjun 
, Sawangchan 
) , worldwide, is a rare last name. The cognomen สว่างจันทร์ is characteristic of Thailand, where it is a rare surname, and Norway, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sawangjun | Thailand |
| Sawangchan | Norway, Thailand |
Sawaengjan, Sawangcahn, Sawangjanh, and Sawongchan