push @Names, $names{$_}{realname}
  foreach keys %names;
[download]

or

push @Names, $_->{realname}
  foreach values %names;
[download]

or

my @Names = map { $_->{realname} } values %names;
[download]

The sigil to use is the type being returned.

%hash       # The entire hash        is a hash.
$hash{key}  # An element of the hash is a scalar.
[download]

See the "Direct" column of this table.