Globally, บุญแพง (บุญแพง 
, Bunpaeng , Bunphang 
) is a very rare unisex first name. The first name บุญแพง is characteristic of South-eastern Asia, particularly Thailand, where it is a rare epicene name. Likewise, บุญแพง is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Bunphaeng, Bunpaeng, บุญแพง | Thailand |
| Bunphang | Malaysia, Thailand |
Boonpaeng, and Boonphaeng