You will rarely need C-style loops

for ($i = 0; $i <= $#sortedNames; $i++) {
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If you need a counting loop, use the much more readable (and just as efficient)

for my $i (0..$#sortedNames) {
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Or when iterating over a list or array, you can use

for my $name (@sortedNames) {
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Why use reverse to prepend a string?

$toOutput = reverse $temp[0];
$toOutput .= $x;
$output = reverse $toOutput;
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is the same as

$output = $x . $temp[0];
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