Why would a German's name be written in Cyrillic?
FTM is showing his usual ethnic biases, and in "Der Wanderer" no less. His colored judgement makes him difficult to believe.
I hadn't a clue as to the nationality, it merely sounded slavic. I have seen Doestoyevsky's name spelled several different ways and I assumed it was because of the different alphabet.
I suspect the difference comes from the phoneticization of the name across-the-border; not different from the "Auschwitz/Oswieczim" spelling difference.