Turn one of your files into a hash. You can use a soundex or other encoding to generate a key, and then an array containing the whole set of data for that name can be stored as the value.

while ( $line = <> ) {
   chomp;
   my @field = split ', ', $line;
   my $key = encode( $field[0] );
   $filedata{$key} = \@field;
}
[download]

Then you can look up entries in the second file. Of course, if you use a general encoding, you'll have to do additional verification if you get a match.