On all my readings regarding Stauffenberg I can’t recall any of them spelling his first name with a ‘C’. It is usually Klaus, wonder why the change now?
Hm, I think I always saw his name with a “C” in my german history books. The fact that he was a count supports this spelling, since his name looks pretty posh written with a “c” :-)
Claus Schenk Graf von Stauffenberg
Klaus Schenk Graf von Stauffenberg
His full name was actually
Claus Philipp Maria Schenk Graf von Stauffenberg