Hardly uncommon. It is reaching the point where we should assume that any Baal Tseuvah is probably safek goy. Where someone who is frum discovers they aren’t Jewish by halacha (or more likely a safek), conversion is very uncomplicated. Among Ashkenazim, a large number of people have been going off the derekh for the last 200+ years, and given the custom of western Jews to use paternal surnames, only a genealogist can determine the halachic status of a non-frum Jew.
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