Family name Nitthayotai (Nitthayotai 
) , in all the world, is a very rare surname. The cognomen Nitthayotai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Nitthayotai | Thailand |
Prapasri, Chayakorn, Thaniyabha, and Thammasak