I'm not sure just what you're asking for here, but maybe one of these will serve:

>perl -wMstrict -le
"foreach my $origName (qw(foo bar baz)) {
   my $newName = qq{gen_$origName};
   my $newCode = sub {
     print qq{generated $origName(@_)};
     };
   no strict 'refs';
   *$newName = $newCode;
   }
 ;;
 gen_foo(1, 2, 3);
 gen_bar(4, 5, 6);
 gen_baz(7, 8, 9);
 ;;
 my $name = 'also_works';
 eval qq{sub $name { print qq{this also works: \@_}; } };
 also_works(9, 8, 7);
"
generated foo(1 2 3)
generated bar(4 5 6)
generated baz(7 8 9)
this also works: 9 8 7
[download]

Update: This can be made a bit more concise (note the slightly tricky disambiguating semicolon in the
    *{; ... } = sub { ... }
statement):

>perl -wMstrict -le
"foreach my $origName (qw(foo bar)) {
   no strict 'refs';
   *{; qq{gen_$origName} } = sub { print qq{generated $origName(@_)} }
+;
   }
 ;;
 gen_foo(1, 2, 3);
 gen_bar(4, 5, 6);
"
generated foo(1 2 3)
generated bar(4 5 6)
[download]