This script…

#!perl

use strict;
use warnings;

binmode DATA,   ':encoding(ISO-8859-1)';
binmode STDOUT, ':encoding(Windows-1252)';

while (my $original_names = <DATA>) {
    chomp $original_names;
    my $normalized_names = normalize_names($original_names);
    print "$original_names => $normalized_names\n";
}

exit 0;

sub normalize_names {
    return join '', map { ucfirst lc $_ } $_[0] =~ m/(\w+|\W+)/g;
};

__DATA__
CLÉ USB
CLÉMMY USB
[download]

…produces this output…

CLÉ USB => Clé Usb
CLÉMMY USB => Clémmy Usb
[download]

…at the Microsoft Windows command prompt (chcp 1252).