Polajewo was formerly part of the German Empire. In the German Empire, the place was called Güldenau (Kr. Scharnikau, Wartheland).
The place is now called Połajewo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Polajewo | German Empire | Obornik/Obernick | before the Versailles Treaty |
| Połajewo | Poland | Czarnków | after the Versailles Treaty |
| Güldenau | German Empire | Scharnikau (Wartheland) | 1939 |
| Güldenau (Kr. Scharnikau, Wartheland) | German Empire | Scharnikau (Wartheland) | 1939 |
| Połajewo | Poland | Czarnków | 1945 |
| Połajewo | Poland | Piła | 1992 |