Gajowka was formerly part of the German Empire. In the German Empire, the place was called Gajówka.
The place is now called Gajówka and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gajowka | Russian Empire | Lenčica | 1914 |
| Gajówka | Poland | Łęczyca | 1921 |
| Gajówka | German Empire | Lentschütz | 1939 |
| Gajówka | Poland | Poddębice | 1945 |
| Gajówka | Poland | Sieradz | 1992 |