Family name Sainaratchai (Sainaratchai 
) , across the world, is a very rare last name. The last name Sainaratchai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sainaratchai | Thailand |
Sumonta, Kittivut, Phanthrawan, and Aphatsanan