Cognomen นิลรัตนา (นิลรัตนา 
) , all around the world, is an extremely rare last name. The family name นิลรัตนา is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, นิลรัตนา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| นิลรัตนา | Thailand |