Cognomen กฤตินัย (Kittanai 
, Kittinai , กฤตินัย ) , around the world, is an extremely rare surname. The family name กฤตินัย is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Predominantly, กฤตินัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kittanai, Kittinai | United States, Thailand |
| Kritinai, กฤตินัย | Thailand |