Surname Kokwangnai (Kokwangnai 
) , around the globe, is an extremely rare cognomen. The last name Kokwangnai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kokwangnai | Thailand |
Kregsak, Pawitchaya, and Atcharaphon