Surname Tiagarajan (Tiagarajan 
) , throughout the world, is a rare last name. The surname Tiagarajan is habitual in Malaysia, where it is a rare surname, and India, where it is an extremely rare surname. Much less frequently, Tiagarajan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tiagarajan | India, Malaysia |