PadWalker provides a var_name function that takes the reference and does that for you. It's even more reliable than looping over the lexicals, when the lexical you want is hidden: 
#!/usr/bin/perl -l
use strict;
use warnings;
use PadWalker ":all";

sub foo {
   my $x;
   for ($x) {
      my $x;
      bar(\$_);
   }
}

sub bar {
    print var_name(1, $_[0]);  # works
    my $vars = peek_my(1);
    print grep $vars->{$_} == $_[0], keys %$vars;  # doesn't work unle
+ss 2nd my $x is commented out
}

foo();

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In reply to Re^2: get name of lexical variable by ysth
in thread get name of lexical variable by khwilliamson

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