Łężec was formerly part of the German Empire. In the German Empire, the place was called Lenze.
The place is now called Łężec and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Lenzec | German Empire | Wreschen | before the Versailles Treaty |
| Łężec | Poland | Września | after the Versailles Treaty |
| Lenze | German Empire | Wreschen | 1939 |
| Łężec | Poland | Słupca | 1945 |
| Łężec | Poland | Konin | 1992 |