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