Surname Nilarun (Nilarun 
) , worldwide, is an extremely rare last name. The cognomen Nilarun is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, Nilarun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nilarun | India, Thailand |
Basu, Guha, Ghosh, Mukherjee, Chakraborty, and Bandyopadhyay