Fonsau was formerly part of the German Empire. In the German Empire, the place was called Fonsau.
The place is now called Vonšov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Fonsau | Austro-Hungary | Eger | before the Treaty of Saint-Germain |
| Vonšov | Czechoslovakia | Cheb | after the Treaty of Saint-Germain |
| Fonsau | Czechoslovakia | Cheb | after the Treaty of Saint-Germain |
| Fonsau | German Empire | Eger | 1938 |
| Fonsava | Czechoslovakia | Cheb | 1945 |
| Vonšov | Czechoslovakia | Cheb | 1992 |
| Vonšov | Czech Republic | Cheb | 1993 |