Just for the alternative, splitting on TAB triggers me to mention Text::CSV_XS (using toolic's hash approach):
use strict;
use warnings;
use Text::CSV_XS;
my $csv = Text::CSV_XS->new ({ sep_char => "\t", auto_diag => 1 });
my %Diag;
while (my $row = $csv->getline (*DATA)) {
push @{$Diag{$row->[0]}}, $row->[1];
}
$csv->eol ("\n");
$csv->sep_char (",");
$csv->print (*STDOUT, [ $_, @{$Diag{$_}} ]) for sort keys %Diag;
__DATA__
Name1 1234
Name2 9999
Name1 5514
Name3 5415
Name2 6419
-->
Name1,1234,5514
Name2,9999,6419
Name3,5415
Enjoy, Have FUN! H.Merijn
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