Dębowiec was formerly part of the German Empire. In the German Empire, the place was called Grünwerder.
The place is now called Dębowiec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Dembowietz | German Empire | Mogilno | before the Versailles Treaty |
| Dębowiec | Poland | Gniezno | after the Versailles Treaty |
| Grünwerder | German Empire | Gnesen | 1939 |
| Dębowiec | Poland | Gniezno | 1945 |
| Dębowiec | Poland | Poznań | 1992 |