Surname Thamvichai (Thamvichai 
) , in the entire world, is a very rare family name. The cognomen Thamvichai is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thamvichai | United States, Thailand |
Sutham, Siriphen, Pitchaporn, Puttiphand, and Ratchaneekorn