Gnin was formerly part of the German Empire. In the German Empire, the place was called Gotthardswalde.
The place is now called Gnin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gnin | German Empire | Grätz | before the Versailles Treaty |
| Gnin | Poland | Nowy Tomyśl | after the Versailles Treaty |
| Gotthardswalde | German Empire | Grätz (Wartheland) | 1939 |
| Gnin | Poland | Wolsztyn | 1945 |
| Gnin | Poland | Poznań | 1992 |