Surname พลอยบุญนาค (พลอยบุญนาค 
, Ploybunnak ) , across the world, is a very rare last name. The cognomen พลอยบุญนาค is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ploybunnak, พลอยบุญนาค | Thailand |