from perldoc cgi:

Pass the param() method a single argument to fetch the value of the named parameter. If the parameter is multivalued (e.g. from multiple selections in a scrolling list), you can ask to receive an array. Otherwise the method will return a single value.

To fix, simply change your syntax :

my @names = $cgi->param("hisname"); #  Use an ARRAY here

 foreach (@names){ ....} # ---- and HERE.
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Or, (based on an alternative interpration of your question), is this syntax you are looking for ?:

 $cgi->append(-name=>'foo',-values=>['yet','more','values']);
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