Cognomen Kitwiliyakun (Kitwiliyakun 
) , worldwide, is a very rare family name. The family name Kitwiliyakun is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kitwiliyakun | Thailand |
Kittaya, Krittaya, and Kritchanok