Across the world, นุสิทธิ์ (นุสิทธิ์ 
) is a rare principally boy's, but very seldom girly forename. The given name นุสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare principally masculine, but very infrequently girly name. Also, นุสิทธิ์ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| นุสิทธิ์ | Thailand |