Last name นิลศักดิ์ (นิลศักดิ์ 
, Nilsak ) , globally, is a very rare family name. The surname นิลศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, นิลศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nilsak, นิลศักดิ์ | Thailand |