Surname Theresya (Theresya 
) , in the world, is a rare last name. The cognomen Theresya is habitual in South-eastern Asia, particularly Indonesia, where it is a rare surname. More prevalently, Theresya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Theresya | Malaysia, Indonesia, India, Democratic Republic of the Congo, United States |