Janov was formerly part of the German Empire. In the German Empire, the place was called Johannesthal.
The place is now called Janov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Johannesthal | Austro-Hungary | Rakonitz | before the Treaty of Saint-Germain |
| Janov | Austro-Hungary | Rakonitz | before the Treaty of Saint-Germain |
| Janové Údolí | Austro-Hungary | Rakonitz | before the Treaty of Saint-Germain |
| Janov | Czechoslovakia | Rakovník | after the Treaty of Saint-Germain |
| Johannesthal | German Empire | Saaz | 1938 |
| Janov | Czechoslovakia | Rakovník | 1945 |
| Janov | Czechoslovakia | Rakovník | 1992 |
| Janov | Czech Republic | Rakovník | 1993 |