Last name Phattanachai (Phattanachai 
) , worldwide, is a very rare family name. The cognomen Phattanachai is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Also, Phattanachai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phattanachai | United States, Thailand |