Gačnik was formerly part of the German Empire. In the German Empire, the place was called Wurmau.
The place is now called Gačnik and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gatschnig | Austro-Hungary | Marburg/Maribor | before the Treaty of Saint-Germain |
| Gačnik | Austro-Hungary | Marburg/Maribor | before the Treaty of Saint-Germain |
| Gačnik | Yugoslavia | Maribor levi breg | after the Treaty of Saint-Germain |
| Wurmau | German Empire | Marburg an der Drau | 1941 |
| Gačnik | Yugoslavia | Maribor | 1945 |
| Gačnik | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Gačnik | Slovenia | Slowenien | 1991 |