Cognomen นิลเพชรรัตน์ (นิลเพชรรัตน์ 
, Nilpetcharat 
) , throughout the world, is a very rare family name. The surname นิลเพชรรัตน์ is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| นิลเพชรรัตน์ | Thailand |
| Nilpetcharat | United States |