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