Rumja was formerly part of the German Empire. In the German Empire, the place was called Rahmel.
The place is now called Rumia and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Rahmel | German Empire | Neustadt i. Westpr. | before the Versailles Treaty |
| Rumja | Poland | Wejherowo | after the Versailles Treaty |
| Rahmel | German Empire | Neustadt (Westpr.) | 1939 |
| Rumia | Poland | Wejherowo | 1945 |
| Rumia | Poland | Gdańsk | 1992 |