Dęby was formerly part of the German Empire. In the German Empire, the place was called Eichen.
The place is now called Dęby and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Eichen | German Empire | Preußisch Eylau | 1939 |
| Dęby | Under Polish administration | Górowo Iławeckie | 1945 |
| Dęby | Poland | Olsztyn | 1992 |