Cognomen Tvrdorijeka (Tvrdorijeka 
) , in all the world, is a very rare surname. The family name Tvrdorijeka is habitual in Southern Europe, particularly Croatia, where it is a rare surname. Much less frequently, Tvrdorijeka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tvrdorijeka | Croatia |