my %tot_count;
++$tot_count{ (/(\S+)/)[0] }
   for @full_names;

my %cur_count;
s/(\S+)/ $1 . ( $tot_count{$1} > 1 ? ++$cur_count{$1} : '' ) /e
   for @full_names;

[download]

Update: Fixed bug.

In reply to Re: Indexing multiplicate firstnames with regex by ikegami
in thread Indexing multiplicate firstnames with regex by stringZ

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