Last name Koungthong (Koungthong 
) , around the world, is an extremely rare cognomen. The last name Koungthong is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, Koungthong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koungthong | United States, Thailand |