Wallach was formerly part of the German Empire. In the German Empire, the place was called Wallach.
The place is now called Bylochov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Wallach | Austro-Hungary | Dauba | before the Treaty of Saint-Germain |
| Bylochov | Austro-Hungary | Dauba | before the Treaty of Saint-Germain |
| Bylochov | Czechoslovakia | Dubá | after the Treaty of Saint-Germain |
| Wallach | Czechoslovakia | Dubá | after the Treaty of Saint-Germain |
| Wallach | German Empire | Dauba | 1938 |
| Bylochov | Czechoslovakia | Roudnice nad Labem | 1945 |
| Bylochov | Czechoslovakia | Litoměřice | 1992 |
| Bylochov | Czech Republic | Litoměřice | 1993 |