Surname Thillairaj (Thillairaj 
) , worldwide, is a very rare family name. The last name Thillairaj is habitual in Malaysia, where it is a very rare surname, Australia, and India, where it is an extremely rare surname. Likewise, Thillairaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thillairaj | Australia, Malaysia, India |