Surname Thammasack (Thammasack 
) , in the world, is quite a rare cognomen. The family name Thammasack is characteristic of Laos, where it is quite a common surname, Thailand, where it is a very rare surname, and France, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thammasack | France, Laos, United States, Thailand |