Family name นิรัตติศัย (Nirattisai 
, นิรัตติศัย , Niratisai ) , globally, is a rare last name. The last name นิรัตติศัย is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. More frequently, นิรัตติศัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nirattisai, Niratisai | United States, Thailand |
| นิรัตติศัย | Thailand |