Thanks Immo
There seems to be at least three possible candidates..!
Does "this" Ehrenrangliste gives the date of promotion..?
If so we can perhaps exclude some of them, as the flyer Hptm Lange was promoted in circa late Sep 1918...
If we can eliminate two of three possible candidates, perhaps the third can be found in some book of his Regiment...?
There exists a whole bunch of books of different German Regiments to my knowledge, and there is a little chance that many officers are mentioned in them...
But it seems to be a very long way to actually find the first name of this fellow..

Gunnar