Family name Chelvanathan (Chelvanathan 
) , worldwide, is a very rare cognomen. The surname Chelvanathan is habitual in Malaysia, where it is a rare surname, Canada, where it is an extremely rare surname, and the United Kingdom. Much less frequently, Chelvanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chelvanathan | United Kingdom, Canada, India, Malaysia, United States |