Cognomen Gerwein (Gerwein 
) , in the entire world, is a very rare family name. The last name Gerwein is habitual in Germany, where it is an extremely rare surname, and the United States. Much less frequently, Gerwein is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gerwein | Philippines, United States, Germany |