Rajkowy was formerly part of the German Empire. In the German Empire, the place was called Raikau.
The place is now called Rajkowy and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Raikau | German Empire | Dirschau | before the Versailles Treaty |
| Rajkowy | Poland | Tczew | after the Versailles Treaty |
| Raikau | German Empire | Dirschau | 1939 |
| Rajkowy | Poland | Tczew | 1945 |
| Rajkowy | Poland | Gdańsk | 1992 |