Cognomen เธีย (Thia 
, Theea 
, เธีย 
) , around the world, is quite a common last name. The last name เธีย is characteristic of Singapore, where it is quite a common surname, Mauritius, where it is quite a rare surname, and Myanmar. In absolute terms, this name is the most popular in South-eastern Asia, particularly Indonesia, Singapore, and Myanmar. Likewise, เธีย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thia | Singapore, France, Malaysia, Indonesia, Myanmar |
| Theea | United States, South Africa, Romania, Indonesia |
| เธีย | Thailand |