Surname Thiagaraj (Thiagaraj 
) , around the globe, is a rare family name. The family name Thiagaraj is habitual in Malaysia, where it is a rare surname, Australia, and the United Kingdom, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Malaysia, India, and Australia. Likewise, Thiagaraj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiagaraj | South Africa, Malaysia, Australia, United States, India |