NN was formerly part of the German Empire. In the German Empire, the place was called Schwarzbach.
The place is now called NN and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sophienthal | Austro-Hungary | Taus | before the Treaty of Saint-Germain |
| Černá Řeka | Austro-Hungary | Taus | before the Treaty of Saint-Germain |
| Černá Řeka | Czechoslovakia | Domažlice | after the Treaty of Saint-Germain |
| Sophienthal | Czechoslovakia | Domažlice | after the Treaty of Saint-Germain |
| Sophienthal | German Empire | Markt Eisenstein | 1938 |
| Sofienthal | German Empire | Markt Eisenstein | 1938 |
| Schwarzbach | German Empire | Markt Eisenstein | 1938 |
| Černá Řeka | Czechoslovakia | Domažlice | 1945 |
| Černá Řeka | Czechoslovakia | Domažlice | 1992 |
| NN | Czech Republic | Domažlice | 1993 |