Surname Тхаы (Thay 
, Txay 
, Тхаы 
) , in the world, is quite a common cognomen. The last name Тхаы is characteristic of South-eastern Asia, particularly Myanmar, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore. In absolute terms, it is commonest in South-eastern Asia, particularly Myanmar, Malaysia, and Indonesia. Also, Тхаы is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thay | Malaysia, Myanmar, India, Vietnam, Indonesia |
| Txay | Brazil, Myanmar |
| Тхаы | Russia |