Surname Тхать (Thạch 
, Тхать 
) , globally, is quite a rare cognomen. The cognomen Тхать is characteristic of Vietnam, where it is quite a rare surname, and Belarus, where it is a rare surname. Also, Тхать is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thạch | Vietnam, United States |
| Тхать | Belarus |