Knaj was formerly part of the German Empire. In the German Empire, the place was called Knai.
The place is now called Knaj and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Knaj | Austro-Hungary | Bielitz/Bielsko | before the Treaty of Saint-Germain |
| Knaj | Poland | Bielsko | after the Treaty of Saint-Germain |
| Knai | German Empire | Bielitz | 1939 |
| Knaj | Poland | Cieszyn | 1945 |
| Knaj | Poland | Bielsko | 1992 |