Surname Kotchasen (Kotchasen 
) , throughout the world, is a very rare family name. The family name Kotchasen is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kotchasen | Thailand |
Mayura, Paweena, Natthakorn, and Natthapawee