Family name Amorrosta (Amorrosta 
) , globally, is a very rare cognomen. The last name Amorrosta is habitual in Argentina, where it is a very rare surname, Spain, and the United States, where it is an extremely rare surname. Very seldom, Amorrosta is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Amorrosta | United States, Spain, Argentina |