Welkau was formerly part of the German Empire. In the German Empire, the place was called Velcí.
The place is now abandoned and the area belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Welkau | Austro-Hungary | Hořowitz | before the Treaty of Saint-Germain |
| Velcí | Austro-Hungary | Hořowitz | before the Treaty of Saint-Germain |
| Veliká | Austro-Hungary | Hořowitz | before the Treaty of Saint-Germain |
| Velcí | Czechoslovakia | Hořovice | after the Treaty of Saint-Germain |
| Welkau | German Empire | Horschowitz | 1939 |
| Velcí | German Empire | Horschowitz | 1939 |
| Velcí | Czechoslovakia | Hořovice | 1945 |
| - aufgelassen - | Czechoslovakia | Příbram | 1992 |
| - aufgelassen - | Czech Republic | Příbram | 1993 |