Cognomen Куммер (Kummer 
, Куммер 
) , across the world, is a common family name. The last name Куммер is habitual in Western Europe, particularly Switzerland, where it is quite a common surname, Austria, and Germany. In absolute terms, it most frequently occurs in Germany, the United States, and Switzerland. Very seldom, Куммер is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kummer | Germany, Austria, Switzerland, United States, Brazil |
| Куммер | Kazakhstan, Russia, Ukraine |