Janovka was formerly part of the German Empire. In the German Empire, the place was called Johannesruh.
The place is now abandoned and the area belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Johannesruh | Austro-Hungary | Kaplitz | before the Treaty of Saint-Germain |
| Janovka | Czechoslovakia | Kaplice | after the Treaty of Saint-Germain |
| Johannesruh | Czechoslovakia | Kaplice | after the Treaty of Saint-Germain |
| Johannesruh | German Empire | Gmünd | 1938 |
| Janovka | Czechoslovakia | Trhové Sviny | 1945 |
| - aufgelassen - | Czechoslovakia | České Budějovice | 1992 |
| - aufgelassen - | Czech Republic | České Budějovice | 1993 |