Last name Therasia (Therasia 
) , throughout the world, is a very rare cognomen. The surname Therasia is characteristic of Indonesia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. More frequently, Therasia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Therasia | Indonesia, Nigeria, United States, India, Democratic Republic of the Congo |