Unin was formerly part of the German Empire. In the German Empire, the place was called Tonnin.
The place is now called Unin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Tonnin | German Empire | Usedom-Wollin | 1939 |
| Unin | Under Polish administration | Wolin | 1945 |
| Unin | Poland | Szczecin | 1992 |