Surname Kalithasan (Kalithasan 
) , all over the world, is a rare last name. The cognomen Kalithasan is habitual in Sri Lanka, where it is quite a rare surname, Malaysia, where it is a rare surname, and Singapore. Not in comparison with a country's population, it is commonest in Sri Lanka, Malaysia, and India. Also, Kalithasan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kalithasan | Singapore, United Kingdom, India, Sri Lanka, Malaysia |