Mierzęcin was formerly part of the German Empire. In the German Empire, the place was called Friedrichsdorf.
The place is now called Mierzęcin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Friedrichsdorf | German Empire | Cosel | 1939 |
| Mierzęcin | Under Polish administration | Koźle | 1945 |
| Mierzęcin | Poland | Opole | 1992 |