Gaaskjer was formerly part of the German Empire. In the German Empire, the place was called Gaaskjer.
The place is now called Gåskær and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gaaskjer | German Empire | Apenrade | before the Versailles Treaty |
| Gaaskær | Denmark | Aabenraa | after the Versailles Treaty |
| Gåskær | Denmark | Sønderjylland | 1993 |