Cognomen พรหมแก้วกุล (พรหมแก้วกุล, Promkaewkul 
) , worldwide, is a very rare surname. The cognomen พรหมแก้วกุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Promkaewkul | Thailand |