Cognomen Rajannan (Rajannan 
) , globally, is a very rare family name. The surname Rajannan is characteristic of Malaysia, where it is a very rare surname, India, where it is an extremely rare surname, and China. More prevalently, Rajannan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajannan | China, United Kingdom, Malaysia, United States, India |