Pilvareljaj was formerly part of the German Empire. In the German Empire, the place was called Deutsch Pillwarren.
The place is now abandoned and the area belongs to Lithuania.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Deutsch-Pillwarren | German Empire | Tilsit | before the Versailles Treaty |
| Pilvarėliai | Lithuania | Pajėgiai | after the Versailles Treaty |
| Deutsch Pillwarren | German Empire | Heydekrug | 1939 |
| Pilvarėliai | Soviet Union | Pagėgiai/Pagegjaj | 1945 |
| Pilvareljaj | Soviet Union | Pagėgiai/Pagegjaj | 1945 |
| - aufgelassen - | Lithuania | Šilutė | 1992 |