Explanation:
For people searching town names in German, they are searching for the original german name. That's = Lemberg. You mean the international or offical name.
That's of course Lwiw.
For a correct working with www.openstreetmap.de/karte you must use the german name (name:de).

Wikipedia: there's a site (English Wikipedia) too, which explains the german name of Lemberg.

To reduce much working with to many wikipedia sites, Wikipedia works with directions, that's right. Therefore Wikipedia use the INTERNATIONL name but not the german name.

https://en.wikipedia.org/wiki/Lemberg_(disambiguation)  -->
Lemberg is the German name for the city of Lviv in Ukraine. It may also refer to: ...