Cognomen Jiakjai (Jiakjai 
) , in the entire world, is a very rare last name. The cognomen Jiakjai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Jiakjai | Thailand |
Alisa, Pirat, Torsak, Nipaporn, and Prapawadee