Cognomen บุญทาย (Bunthai 
, บุญทาย ) , around the globe, is a very rare last name. The surname บุญทาย is characteristic of Thailand, where it is a rare surname, Cambodia, where it is a very rare surname, and China, where it is an extremely rare surname. Likewise, บุญทาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bunthai | China, Cambodia, United States, Thailand, France |
| บุญทาย | Thailand |