Łajs was formerly part of the German Empire. In the German Empire, the place was called Layß.
The place is now called Łajs and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Layß | German Empire | Neidenburg | 1939 |
| Łajs | Under Polish administration | Nidzica | 1945 |
| Łajs | Poland | Olsztyn | 1992 |