The best example of a spelling nightmare is probably one of the most common last names in Germany:
Meier or Maier? Or Mayer, Meyer, Mair, Meir, Mayr, Meyr. Or whatever.
It gets even more difficult if there are additional variations in another language as well: e.g. in English: Myer, Myers.
One should always pay close attention to how a name is spelled. Even a small change in the name can lead one on the trail of a completely different family.
Likewise with first names: Wilhelmine or Wilhelmina, Julie or Julia, etc.
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