Surname บุญจาย (บุญจาย 
) , across the world, is a very rare last name. The surname บุญจาย is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, บุญจาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| บุญจาย | Thailand |