Cognomen Rajahkumar (Rajahkumar 
) , all around the world, is a very rare family name. The cognomen Rajahkumar is habitual in Malaysia, where it is a very rare surname, Netherlands, and Canada, where it is an extremely rare surname. Much less frequently, Rajahkumar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajahkumar | Canada, Malaysia, India, Netherlands |