Cognomen Nilbir (Nilbir 
) , all around the world, is a rare family name. The family name Nilbir is habitual in Southern Asia, particularly India, where it is a very rare surname. Very seldom, Nilbir is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nilbir | India |
Kambam, Huirem, Thoudam, Wairokpam, and Nongmaithem