Iwiec was formerly part of the German Empire. In the German Empire, the place was called Iwitz.
The place is now called Iwiec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Iwitz | German Empire | Tuchel | before the Versailles Treaty |
| Iwiec | Poland | Tuchola | after the Versailles Treaty |
| Iwitz | German Empire | Tuchel | 1939 |
| Iwiec | Poland | Tuchola | 1945 |
| Iwiec | Poland | Bydgoszcz | 1992 |