Last name Janarthan (Janarthan 
) , around the world, is a rare family name. The family name Janarthan is characteristic of Sri Lanka, where it is quite a rare surname, Australia, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Sri Lanka, India, and Indonesia. Also, Janarthan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janarthan | Malaysia, India, Sri Lanka, Indonesia, Australia |