Cognomen แก้วกุลนิล (แก้วกุลนิล, Kaewkulnin 
) , around the world, is a very rare family name. The last name แก้วกุลนิล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaewkulnin | Thailand |