Rookies assume an ancestor’s name has only one correct spelling.
Rookies may reject sources that show the ancestor’s name spelled differently than expected. They often insist the family has always spelled the name just one way. They may be uncomfortable with variant spellings because they assume different spellings are a sign their ancestors were uneducated. They overlook the possibility that it was a clerk (not family) that spelled the name differently.
Consequences: Missed sources, missed opportunities, missed clues, incomplete and stunted genealogies.
Experienced researchers would find it unusual if they found only one spelling in all of the records for a particular person. They expect and actively seek out as many variant spellings of the name as possible. Experienced researchers look for names under middle names, initials, abbreviations, and nicknames. They use the International Genealogical Index to find alternate spellings to surnames. And they use spelling substitution tables to figure out even more possible alternates spellings of the surname.