Surname Khwantongin (Khwantongin 
) , all around the world, is an extremely rare cognomen. The family name Khwantongin is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khwantongin | Thailand |
Wagee, Jirapawn, and Piyamapawn