Family name Ratnakrishnan (Ratnakrishnan 
) , in all the world, is a very rare last name. The last name Ratnakrishnan is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname. Also, Ratnakrishnan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnakrishnan | Malaysia |