Ciemnik was formerly part of the German Empire. In the German Empire, the place was called Köhlerbruch.
The place is now called Węglarki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Czemnik | German Empire | Schwetz | before the Versailles Treaty |
| Wenglarken | German Empire | Schwetz | before the Versailles Treaty |
| Ciemnik | Poland | Świecie | after the Versailles Treaty |
| Węglarki | Poland | Świecie | after the Versailles Treaty |
| Köhlerbruch | German Empire | Schwetz (Weichsel) | 1939 |
| Ciemniki | Poland | Świecie | 1945 |
| Węglarki | Poland | Świecie | 1945 |
| Ciemnik | Poland | Bydgoszcz | 1992 |
| Węglarki | Poland | Bydgoszcz | 1992 |