Family name บุญจันทร์ (บุญจันทร์ 
, Boonchan 
, Bunchan 
) , worldwide, is a common surname. The cognomen บุญจันทร์ is habitual in Thailand, where it is quite a common surname, and the United States, where it is an extremely rare surname. Likewise, บุญจันทร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| บุญจันทร์ | Thailand |
| Boonchan | United States, United Kingdom, Malaysia, Thailand |
| Bunchan | United Kingdom, Australia, India, Thailand, United States |
| Boonjan | United States, Malaysia, Thailand |