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