Mierzym was formerly part of the German Empire. In the German Empire, the place was called Mersin.
The place is now called Mierzym and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Mersin | German Empire | Köslin | 1939 |
| Mierzym | Under Polish administration | Koszalin | 1945 |
| Mierzym | Poland | Koszalin | 1992 |