Opstainiai was formerly part of the German Empire. In the German Empire, the place was called Absteinen.
The place is now called Opstainys and belongs to Lithuania.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Absteinen | German Empire | Tilsit | before the Versailles Treaty |
| Opstainiai | Lithuania | Pajėgiai | after the Versailles Treaty |
| Absteinen | German Empire | Tilsit-Ragnit | 1939 |
| Opštainiai | Soviet Union | Pagėgiai/Pagegjaj | 1945 |
| Opštajnjaj | Soviet Union | Pagėgiai/Pagegjaj | 1945 |
| Opstainys | Lithuania | Šilutė | 1992 |