Cognomen Periyar (Periyar 
) , across the world, is a rare family name. The surname Periyar is habitual in Nepal, where it is a rare surname, Singapore, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is commonest in Nepal, India, and Malaysia. Much less frequently, Periyar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Periyar | Singapore, Malaysia, India, Nepal, Australia |
| periyar dasan Rationalist Indian Thinker, Scholar & Activist, IN (b. 1949) |
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