Family name รัตนิล (รัตนิล 
) , in all the world, is a rare cognomen. The last name รัตนิล is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, รัตนิล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตนิล | Thailand |