Cognomen นิทร์ (Ni 
, นิทร์ 
) , worldwide, is a widespread family name. The cognomen นิทร์ is habitual in Mongolia, where it is a widespread surname, Myanmar, where it is a common surname, and Malaysia, where it is quite a common surname (explore the name in all countries). In absolute terms, it most frequently occurs in China, Myanmar, and India. Likewise, นิทร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ni | China, Indonesia, India, Mongolia, Myanmar |
| นิทร์ | Thailand |