Last name บุญแพง (บุญแพง 
, Bunpaeng , Bunphang 
) , globally, is a rare surname. The cognomen บุญแพง is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Also, บุญแพง is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bunpaeng, Bunphaeng, บุญแพง | Thailand |
| Bunphang | Malaysia, Thailand |
Boonpaeng, and Boonphaeng