Sójka was formerly part of the German Empire. In the German Empire, the place was called Eichelmühle, Fh..
The place is now called Jełguń * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Soykamühle | German Empire | Allenstein | 1938 |
| Eichelmühle, Fh. | German Empire | Allenstein | 1939 |
| Sójka | Under Polish administration | Olsztyn | 1945 |
| Jełguń * | Poland | Olsztyn | 1992 |