Hagenbjærg was formerly part of the German Empire. In the German Empire, the place was called Hagenberg.
The place is now called Havnbjerg and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hagenberg | German Empire | Sonderburg | before the Versailles Treaty |
| Hagenbjærg | Denmark | Sønderborg | after the Versailles Treaty |
| Havnbjerg | Denmark | Sønderjylland | 1993 |