Surname Koothayan (Koothayan 
) , in the entire world, is a very rare family name. The last name Koothayan is characteristic of South-eastern Asia, particularly Malaysia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koothayan | Malaysia |
Madam, K Agisparayan, Santhi, Palaraja, and Asokan P S N