Petersdorf was formerly part of the German Empire. In the German Empire, the place was called Petersdorf.
The place is now called Mokrzyn and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Petersdorf | German Empire | Bütow | 1939 |
| Mokrzyn | Under Polish administration | Bytów | 1945 |
| Mokrzyn | Poland | Słupsk | 1992 |