Family name บุญอ้วน (Bun 
, บุญอ้วน) , across the world, is a common surname. The surname บุญอ้วน is habitual in Malaysia, where it is quite a common surname, Brunei, and Hong Kong, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Malaysia, Indonesia, and the United States. Much less frequently, บุญอ้วน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bun | Myanmar, Pakistan, United States, Indonesia, Malaysia |