Sierzno was formerly part of the German Empire. In the German Empire, the place was called Zerrin.
The place is now called Sierzno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Zerrin, Königlich | German Empire | Bütow | 1914 |
| Zerrin | German Empire | Bütow | 1939 |
| Sierzno | Under Polish administration | Bytów | 1945 |
| Sierzno | Poland | Słupsk | 1992 |