Šlažai was formerly part of the German Empire. In the German Empire, the place was called Schlaßen.
The place is now called Šlažai and belongs to Lithuania.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Schlaszen | German Empire | Heydekrug | before the Versailles Treaty |
| Šlažai | Lithuania | Šilutė | after the Versailles Treaty |
| Schlaßen | German Empire | Heydekrug | 1939 |
| Šležai | Soviet Union | Šilutė/Šilute | 1945 |
| Šljažaj | Soviet Union | Šilutė/Šilute | 1945 |
| Šlažai | Lithuania | Šilutė | 1992 |