Hoernly was formerly part of the German Empire. In the German Empire, the place was called Dreihäuser.
The place is now called Les Trois Maisons, Ferme and belongs to France.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Dreihäuser | German Empire | Mülhausen | before the Versailles Treaty |
| Hörnle | German Empire | Mülhausen | before the Versailles Treaty |
| Hoernly | France | Haut-Rhin | after the Versailles Treaty |
| Dreihäuser | German Empire | Mülhausen | 1940 |
| Les Trois Maisons, Ferme | France | Haut-Rhin | 1945 |
| Les Trois Maisons, Ferme | France | Haut-Rhin | 1993 |