Family name Radmanic (Radmanic 
) , in the world, is a very rare cognomen. The surname Radmanic is habitual in Slovenia, where it is quite a rare surname, Croatia, where it is a rare surname, and Argentina, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Slovenia, Germany, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Radmanic | United States, Croatia, Slovenia, Germany, Argentina |