Radejčín was formerly part of the German Empire. In the German Empire, the place was called Radzein.
The place is now called Radejčín and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Radzein | Austro-Hungary | Leitmeritz | before the Treaty of Saint-Germain |
| Radejšín | Austro-Hungary | Leitmeritz | before the Treaty of Saint-Germain |
| Radejčín | Czechoslovakia | Litoměřice | after the Treaty of Saint-Germain |
| Radzein | Czechoslovakia | Litoměřice | after the Treaty of Saint-Germain |
| Radzein | German Empire | Leitmeritz | 1938 |
| Radejčín | Czechoslovakia | Ústí nad Labem | 1945 |
| Radejčín | Czechoslovakia | Ústí nad Labem | 1992 |
| Radejčín | Czech Republic | Ústí nad Labem | 1993 |