Jejsing was formerly part of the German Empire. In the German Empire, the place was called Jeising.
The place is now called Jejsing (Tønder-Jejsing) and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Jeising | German Empire | Tondern | before the Versailles Treaty |
| Jejsing | Denmark | Tønder | after the Versailles Treaty |
| Jejsing (Tønder-Jejsing) | Denmark | Sønderjylland | 1993 |