Cognomen Viriyachai (Viriyachai 
) , in the entire world, is a very rare family name. The family name Viriyachai is habitual in Thailand, where it is a very rare surname, Cambodia, and the United States, where it is an extremely rare surname. Much less frequently, Viriyachai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Viriyachai | United States, Cambodia, Thailand |