I have never seen any other word in German than "Batman". But if it would be translated it would be "Fledermausmensch" or Fledermausmann".

We use lots of English words. We even invent some of them. So we call our cellphone (mobile phone) "Handy" (plural: Handys) and pronounce the word the English way. It is really confusing for a German to talk to a native speaker and find that they do not understand the word "Handy" which for us just must have an English origin.

Wolfgang