Knižnitz was formerly part of the German Empire. In the German Empire, the place was called Kněžnice.
The place is now called Kněžnice and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Knižnitz | Austro-Hungary | Semil | before the Treaty of Saint-Germain |
| Knížnice | Austro-Hungary | Semil | before the Treaty of Saint-Germain |
| Kněžnice | Czechoslovakia | Semily | after the Treaty of Saint-Germain |
| Knischnitz | German Empire | Semil | 1939 |
| Kněžnice | German Empire | Semil | 1939 |
| Kněžnice | Czechoslovakia | Semily | 1945 |
| Kněžnice | Czechoslovakia | Východní Čechy | 1992 |