NAME:
foreach my $name ( @name_array ) {
  FILE:
    foreach my $file ( @files ) {
        open my $fh, '<', $file
            or die "Can't read '$file': $!";
        while ( my $line = <$fh> ) {
            chomp $line;
            if ( lc $line eq lc $name ) {
                print OUTPUTFILE "$line\n";
                next FILE;
            }
        }
    }
}