Alt-Gacz was formerly part of the German Empire. In the German Empire, the place was called Gatsch.
The place is now called Gać Stara (Mysłowice-Gać Stara) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Alt-Gacz | German Empire | Pleß | before the Versailles Treaty |
| Stara Gać | Poland | Pszczyna | after the Versailles Treaty |
| Gatsch | German Empire | Pleß | 1939 |
| Gać | Poland | Pszczyna | 1945 |
| Gać Stara (Mysłowice-Gać Stara) | Poland | Katowice | 1992 |