Surname Jhongkaijak (Jhongkaijak 
) , around the globe, is a very rare cognomen. The surname Jhongkaijak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Jhongkaijak | Thailand |
Purit, Phurit, Purith, Suplern, and Thatchaphon