Mechnacz was formerly part of the German Empire. In the German Empire, the place was called Eichdorf.
The place is now called Mechnacz and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mechnatsch | German Empire | Birnbaum | before the Versailles Treaty |
| Mechnacz | Poland | Międzychód | after the Versailles Treaty |
| Eichdorf | German Empire | Birnbaum (Wartheland) | 1939 |
| Mechnacz | Poland | Międzychód | 1945 |
| Mechnacz | Poland | Poznań | 1992 |