Zajączków was formerly part of the German Empire. In the German Empire, the place was called Haasenau.
The place is now called Zajączków and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Haasenau | German Empire | Trebnitz | 1939 |
| Zajączków | Under Polish administration | Trzebnica | 1945 |
| Zajączków | Poland | Wrocław | 1992 |