Updated the document with a column giving the Soundex code (http://perldoc.perl.org/Text/Soundex.html) for just the first name (since last names are all the same. For the 593 entries, there are only 296 unique Soundex codes.

EDIT: BTW, the original form of the name is Brittany, so the top misspelling technically is not. This is one of the cases, like babe converting to baby where the misspelled and/or affectionate form became dominant.

theoretically one could account for this as edit distance in phoneme space...