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