Aalkær was formerly part of the German Empire. In the German Empire, the place was called Aalkjer.
The place is now called Ålkær and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Aalkjer | German Empire | Hadersleben | before the Versailles Treaty |
| Aalkær | Denmark | Haderslev | after the Versailles Treaty |
| Ålkær | Denmark | Sønderjylland | 1993 |