Hi,
if you search within german white pages (
www.dastelefonbuch.de) for the names:
-Düsedau, you'll find 27 persons (Düsedau is also a village in Saxony Anhalt)
-Dusedach, you'll find 0 persons
-Düsedach, you'll find 0 persons
So it is very probable that the name Dusedach (and Düsedach) does/did not exist.
Search in Google for "Düesedau" in quotation marks gives many results.
Search in Googele for "Dusedach" gives only 4 probably interrelated (erroneous?) Luftwaffe results.
Search in Google for "Düsedach" in quotation marks also gives no results.
https://www.google.com/search?q=%22d...t=gws-wiz-serp
https://www.google.com/search?q=%22d...t=gws-wiz-serp
bye
Frank