Hammer was formerly part of the German Empire. In the German Empire, the place was called Hamry.
The place is now called Hamry and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hammer | Austro-Hungary | Proßnitz | before the Treaty of Saint-Germain |
| Hamry | Austro-Hungary | Proßnitz | before the Treaty of Saint-Germain |
| Hamry | Czechoslovakia | Prostějov | after the Treaty of Saint-Germain |
| Hammer | German Empire | Proßnitz | 1939 |
| Hamry | German Empire | Proßnitz | 1939 |
| Hamry | Czechoslovakia | Prostějov | 1945 |
| Hamry | Czechoslovakia | Jižní Morava | 1992 |