Rosenberger vs Rosenberg?

i've been researching family tree , have come across surname rosenberger. variation of name rosenberg or imply rosenbergers may have originated in separate area, germany vs switzerland?

in same place, pennsylvania church , town records record 1 of ancestors names wm. isenberger instead of correct form william eisenberg. why add -er end of -berg last name?

i've been researching family tree , have come across surname rosenberger. variation of name rosenberg or imply rosenbergers may have originated in separate area, germany vs switzerland? in same place, pennsylvania church , town records record one...

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