Cognomen Klongkoi (Klongkoi 
) , in the world, is a very rare surname. The last name Klongkoi is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Klongkoi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Klongkoi | Thailand, India |