Cognomen Marthia (Marthia 
) , throughout the world, is a rare surname. The surname Marthia is habitual in Indonesia, where it is a very rare surname, Nigeria, and the United States, where it is an extremely rare surname. More prevalently, Marthia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Marthia | Indonesia, Democratic Republic of the Congo, South Africa, United States, Nigeria |