Family name Karunanathan (Karunanathan 
) , in the world, is a very rare cognomen. The cognomen Karunanathan is characteristic of Singapore, where it is a very rare surname, Canada, where it is an extremely rare surname, and South Africa. Likewise, Karunanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karunanathan | South Africa, Canada, France, Singapore, India |