Surname นิลกาญจน์ (นิลกาญจน์ 
, Nilkan 
, Nillakarn ) , throughout the world, is a rare family name. The cognomen นิลกาญจน์ is habitual in Thailand, where it is a rare surname, Venezuela, where it is an extremely rare surname, and India. Likewise, นิลกาญจน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| นิลกาญจน์, Nillakarn | Thailand |
| Nilkan | Thailand, India, Colombia, Venezuela |
Nilakarn, Nilkarn, Nilkarnchon, Nillkan, and Niltakarn