Cognomen Amirthanathan (Amirthanathan 
) , worldwide, is a rare last name. The family name Amirthanathan is characteristic of Sri Lanka, where it is a rare surname, Malaysia, and Norway. Likewise, Amirthanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Amirthanathan | Norway, Malaysia, India, Indonesia, Sri Lanka |