Fedorwalde was formerly part of the German Empire. In the German Empire, the place was called Fedorwalde.
The place is now called Osiniak and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Fedorwalde | German Empire | Sensburg | 1939 |
| Osiniak | Under Polish administration | Mrągowo | 1945 |
| Osiniak | Poland | Suwałki | 1992 |