Surname Kaithongsuk (Kaithongsuk 
) , globally, is a very rare cognomen. The last name Kaithongsuk is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaithongsuk | Thailand |
Somkhit, Winchai, Pritsana, Sasithorn, and Thawatchai