Surname Oerer (Oerer 
) , in all the world, is a very rare cognomen. The surname Oerer is habitual in Switzerland, where it is a rare surname, Bulgaria, and Denmark, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, Switzerland, and Bulgaria. Much less frequently, Oerer is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oerer | Germany, Switzerland, Bulgaria, United States, Denmark |