Surname Karnjanakul (Karnjanakul 
) , in all the world, is a very rare family name. The cognomen Karnjanakul is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Karnjanakul is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karnjanakul | Thailand, United States |