Surname Prahalathan (Prahalathan 
) , worldwide, is a rare family name. The surname Prahalathan is habitual in Australia, where it is a rare surname, Malaysia, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Australia, India, and Malaysia. Much less frequently, Prahalathan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Prahalathan | Australia, Malaysia, India, United States, United Kingdom |