Zajączek was formerly part of the German Empire. In the German Empire, the place was called Hasenwinkel.
The place is now called Zajączek and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hasenwinkel | German Empire | Preußisch Stargard | before the Versailles Treaty |
| Zajączek | Poland | Starogard | after the Versailles Treaty |
| Hasenwinkel | German Empire | Preußisch Stargard | 1939 |
| Zajączek | Poland | Starogard Gdański | 1945 |
| Zajączek | Poland | Gdańsk | 1992 |