The chorus could have been translated in other ways. German sentences with "man" can be translated into "one" in English, so it could have easily been "one can call me only the vagabond". On the other hand, a less direct translation could be "my name is just (the) vagabond" (same as the first sentence could be "people have mistreated and beaten me like a dog"), but I think I've used an acceptable middle ground - please comment if you think this or something else can be done better, I do read those comments and head them if they make sense. :)