Surname นิลชัย (นิลชัย 
, Nillchai , Nilchai 
) , around the world, is a rare family name. The surname นิลชัย is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, นิลชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nillchai, นิลชัย | Thailand |
| Nilchai | Thailand, United States |