Kay was formerly part of the German Empire. In the German Empire, the place was called Kay.
The place is now called Kije and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kay | German Empire | Züllichau-Schwiebus | 1939 |
| Kije | Under Polish administration | Świebodzin | 1945 |
| Kije | Poland | Zielona Góra | 1992 |