Last name Ratnas (Ratnas 
) , throughout the world, is a rare cognomen. The last name Ratnas is habitual in Indonesia, where it is a very rare surname, Malaysia, and Canada, where it is an extremely rare surname. In absolute terms, it is the most numerous in Indonesia, India, and Malaysia. Very seldom, Ratnas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnas | Indonesia, Canada, India, Malaysia, United States |
| pandi-perumal seithikurippu ratnas researcher (b. 1964) |
|