Cognomen Wachai (Wachai 
) , globally, is a rare family name. The cognomen Wachai is habitual in Kenya, where it is quite a rare surname, Israel, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Kenya, the United Kingdom, and the United States. Much less frequently, Wachai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wachai | Kenya, Thailand, United States, India, United Kingdom |