Siejba was formerly part of the German Empire. In the German Empire, the place was called Grundensee *.
The place is now called Siejba and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Scheuba | German Empire | Lötzen | 1914 |
| Grundensee * | German Empire | Lötzen | 1939 |
| Siejba | Under Polish administration | Giżycko | 1945 |
| Siejba | Poland | Suwałki | 1992 |