In my automobile atlas of Austria, I can see a place named Kavallar located near the eastern (not western) end of the Weissensee. While Kavallar is not at the shores of the lake, it is almost there.

The Weissenbach (Weissen brook) flows east to Stockenboi, and later the Drau valley.

South of Kavallar is a place called Kavallaralm, a grazing pasture in the mountains.