Cognomen Ratnakumaran (Ratnakumaran 
) , around the globe, is a very rare family name. The family name Ratnakumaran is characteristic of Malaysia, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United Kingdom. In absolute terms, the name is most common in Malaysia, India, and Canada. Also, Ratnakumaran is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnakumaran | India, Canada, United Kingdom, Malaysia |