Bæk (Haderslev-Bæk) was formerly part of the German Empire. In the German Empire, the place was called Bek (b. Wonsbek).
The place is now called Bæk (Haderslev-Bæk) and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Bek (b. Wonsbek) | German Empire | Hadersleben | before the Versailles Treaty |
| Bæk | Denmark | Haderslev | after the Versailles Treaty |
| Bæk (Haderslev-Bæk) | Denmark | Sønderjylland | 1993 |