Family name Reghunathan Nair (Reghunathan Nair 
) , all over the world, is a very rare surname. The cognomen Reghunathan Nair is characteristic of Southern Asia, particularly India, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Reghunathan Nair | India |
Renjith, and Anandakrishnan