Here is one way of doing it - output format is different than the OP requested, but IMHO, this is easier for human consumption: 
use strict;
use warnings;

my %HoA = (
    flintstones => [qw/fred barney george/],
    jetsons     => [qw/george fred elroy/],
    simpsons    => [qw/fred marge bart barney/]
);


my %d2;
for my $k(keys %HoA){
   for (@{$HoA{$k}}){
      push @{$d2{$_}}, $k;
   }
}
for my $k(sort keys %d2){
   next unless $#{$d2{$k}} >0;
   print "$k:\t (", join (",",sort @{$d2{$k}}),")\n";
}

[download]
Output: 
barney:     (flintstones,simpsons)
fred:       (flintstones,jetsons,simpsons)
george:     (flintstones,jetsons)

[download]

            "XML is like violence: if it doesn't solve your problem, use more."

In reply to Re: get duplicates in hash array by NetWallah
in thread get duplicates in hash array by arunshankar.c

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.