Iłownica was formerly part of the German Empire. In the German Empire, the place was called Gillnitz.
The place is now called Iłownica and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gillnitz | German Empire | Berent | before the Versailles Treaty |
| Iłownica | Poland | Kościerzyna | after the Versailles Treaty |
| Gillnitz | German Empire | Berent (Westpr.) | 1939 |
| Iłownica | Poland | Kościerzyna | 1945 |
| Iłownica | Poland | Gdańsk | 1992 |