In the world, Nillen (Nillen 
) is a very rare gender-neutral given name. The forename Nillen is characteristic of Philippines, where it is a very rare predominantly female, but very seldom male name, and India, where it is an extremely rare male name. Also, Nillen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Nillen | Philippines, India, Mexico, United States, Venezuela |