Cognomen เพ็งแจ่มแจ้ง (เพ็งแจ่มแจ้ง, Pengjamjang 
) , in the world, is an extremely rare family name. The last name เพ็งแจ่มแจ้ง is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pengjamjang | Thailand |