Nejdek was formerly part of the German Empire. In the German Empire, the place was called Neudek.
The place is now called Nejdek and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Neudek | Austro-Hungary | Nikolsburg | before the Treaty of Saint-Germain |
| Nýdek | Austro-Hungary | Nikolsburg | before the Treaty of Saint-Germain |
| Nejdek | Austro-Hungary | Nikolsburg | before the Treaty of Saint-Germain |
| Nejdek | Czechoslovakia | Mikulov | after the Treaty of Saint-Germain |
| Neudek | Czechoslovakia | Mikulov | after the Treaty of Saint-Germain |
| Neudek | German Empire | Nikolsburg | 1938 |
| Nejdek | Czechoslovakia | Břeclav | 1945 |
| Nejdek | Czechoslovakia | Břeclav | 1992 |
| Nejdek | Czech Republic | Břeclav | 1993 |