Rentfiny, Fw. was formerly part of the German Empire. In the German Empire, the place was called Rentfin.
The place is now called Bogumiłki and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Rentfiny, Fw. | Russian Empire | Rypin | 1914 |
| Bogumilki | Russian Empire | Rypin | 1914 |
| Rentfiny, Fw. | Poland | Rypin | after the Versailles Treaty |
| Bogumiłki | Poland | Rypin | after the Versailles Treaty |
| Rentfin | German Empire | Rippin (Westpr.) | 1939 |
| Rętfiny | Poland | Golub-Dobrzyń | 1945 |
| Bogumiłki | Poland | Golub-Dobrzyń | 1945 |
| Rętwiny | Poland | Toruń | 1992 |
| Bogumiłki | Poland | Toruń | 1992 |