This site, Name Thesaurus, has spelling and other variants for millions of names. Most of the variants are phonetic and appear to be English/Germanic based, but this site can give you a good working list of possible alternate spellings for most surnames.
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Thank you so much for this information. I was just yesterday trying to find some alternate spellings for Berehmann, which I think is spelled wrong. This is a Germanic name, so this site should help.
Thank u for this new nAmerican update.