Lonken was formerly part of the German Empire. In the German Empire, the place was called Friedrichssee.
The place is now called Łąkie and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Lonken | German Empire | Bütow | 1937 |
| Friedrichssee | German Empire | Bütow | 1939 |
| Łąkie | Under Polish administration | Bytów | 1945 |
| Łąkie | Poland | Słupsk | 1992 |