Gacki was formerly part of the German Empire. In the German Empire, the place was called Gatzken, Kr. Schwetz (Weichsel).
The place is now called Gacki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gatzki | German Empire | Schwetz | before the Versailles Treaty |
| Gacki | Poland | Świecie | after the Versailles Treaty |
| Gatzken, Kr. Schwetz (Weichsel) | German Empire | Schwetz (Weichsel) | 1939 |
| Gacki | Poland | Świecie | 1945 |
| Gacki | Poland | Bydgoszcz | 1992 |