Dębowy Gaj was formerly part of the German Empire. In the German Empire, the place was called Siebeneichen.
The place is now called Dębowy Gaj and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Siebeneichen | German Empire | Löwenberg i. Schles. | 1939 |
| Dębowy Gaj | Under Polish administration | Lwówek Śląski | 1945 |
| Dębowy Gaj | Poland | Jelenia Góra | 1992 |