Osiek I was formerly part of the German Empire. In the German Empire, the place was called Hackweiler.
The place is now called Osiek Pierwszy and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Osiek | German Empire | Jarotschin | before the Versailles Treaty |
| Osiek I | Poland | Jarocin | after the Versailles Treaty |
| Hackweiler | German Empire | Jarotschin | 1939 |
| Osiek | Poland | Jarocin | 1945 |
| Osiek Pierwszy | Poland | Kalisz | 1992 |