Zummern was formerly part of the German Empire. In the German Empire, the place was called Zummern.
The place is now called Souměř and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zummern | Austro-Hungary | Tachau | before the Treaty of Saint-Germain |
| Souměř | Austro-Hungary | Tachau | before the Treaty of Saint-Germain |
| Souměř | Czechoslovakia | Tachov | after the Treaty of Saint-Germain |
| Zummern | Czechoslovakia | Tachov | after the Treaty of Saint-Germain |
| Zummern | German Empire | Tachau | 1938 |
| Souměř | Czechoslovakia | Tachov | 1945 |
| Souměř | Czechoslovakia | Tachov | 1992 |
| Souměř | Czech Republic | Tachov | 1993 |