Make a chart with all your variant spellings for a surname and their corresponding Soundex codes. You don’t need the Soundex code to search, but the chart can be sorted by Soundex when preforming Soundex based searches so that you will know which searches locate what names so that you don’t needlessly perform the same search.
After all, Trantvetter and Trontvetter have the same Soundex code. A Soundex search for Trantvetter will find Trontvetter.
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