Bugaj was formerly part of the German Empire. In the German Empire, the place was called Steinfeld.
The place is now called Bugaj and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Steinfeld | German Empire | Krotoschin | before the Versailles Treaty |
| Koryta * | German Empire | Krotoschin | before the Versailles Treaty |
| Bugaj | Poland | Krotoszyn | after the Versailles Treaty |
| Steinfeld | German Empire | Krotoschin | 1939 |
| Bugaj | Poland | Ostrów Wielkopolski | 1910 |
| Bugaj | Poland | Kalisz | 1992 |