Cognomen Antnia (Antnia 
) , throughout the world, is an extremely rare last name. The last name Antnia is habitual in Spain, where it is a very rare surname, and Argentina, where it is an extremely rare surname. More prevalently, Antnia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Antnia | Portugal, Spain, Mexico, Nigeria, Brazil |