Jesionowiec was formerly part of the German Empire. In the German Empire, the place was called Eschenwalde.
The place is now called Jesionowiec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Jeschonowitz | German Empire | Ortelsburg | 1930 |
| Eschenwalde | German Empire | Ortelsburg | 1939 |
| Jesionowiec | Under Polish administration | Szczytno | 1945 |
| Jesionowiec | Poland | Olsztyn | 1992 |