This smells like bad design.
However, provided it is CGI, you can easily do:

# If I got you right and the variable in question was multivalue
# (as you represented it with a Perl array):
my ( $username, $path, @names ) = $cgi->param("names");

# to geht what you need for the following:
my @value; # will contain the values.

foreach my $i ( 0 .. $#names ) {
    my $combined_name = $username . "-" . $names[$i]; # build the key
    $value[$i] = $cgi->param("$combined_name");       # fetch the valu
+e
}
[download]

Update: Code rewritten as foreach loop

Cheerio, Sören