Cognomen Nittayasak (Nittayasak 
) , across the world, is an extremely rare surname. The surname Nittayasak is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Nittayasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nittayasak | Thailand |