Rojęczyn was formerly part of the German Empire. In the German Empire, the place was called Roniken.
The place is now called Rojęczyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Roniken | German Empire | Guhrau | before the Versailles Treaty |
| Rojęczyn | Poland | Leszno | after the Versailles Treaty |
| Roniken | German Empire | Lissa (Wartheland) | 1939 |
| Rojęczyn | Poland | Leszno | 1945 |
| Rojęczyn | Poland | Leszno | 1992 |