Surname นุสิทธิ์ (นุสิทธิ์ 
) , across the world, is a very rare cognomen. The last name นุสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Likewise, นุสิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| นุสิทธิ์ | Thailand |