Surname Khianthongkul (Khianthongkul 
) , in all the world, is a very rare cognomen. The last name Khianthongkul is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khianthongkul | Thailand |
Kiat, Kiraphat, and Patchrapron