My Validation class is
use Phalcon\Validation,
Phalcon\Validation\Validator\PresenceOf,
Phalcon\Validation\Validator\Email;
use Phalcon\Validation\Validator\Regex;
 class MemberBulkFormAddVal extends Validation
 {
     public function initialize()
     {
        for ($i = 1; $i <= MEMBER_BULK_ADD_COUNT; $i++) {
            $this->add('member_first_name_$i', new PresenceOf(array(
                'message' => "The First name is required $i"
            )));
            $this->add('member_first_name_$i', new Regex(array(
                'message' => "The First name is invalid $i",
                'pattern' => '/^[A-Za-z ]*$/'
            )));
            $this->add('member_last_name_$i', new PresenceOf(array(
                'message' => "The Last name is required $i"
            )));
        }
    }
 }
My Form Class is 
use Phalcon\Forms\Form,
Phalcon\Forms\Element\Text,
Phalcon\Forms\Element\Select,
Phalcon\Forms\Element\Hidden,
Phalcon\Forms\Element\Password,
Phalcon\Forms\Element\Submit;
use Phalcon\Validation;
use Phalcon\Forms\Element\Check;
class MemberBulkAddForm extends Form
{
    /**
     * Forms initializer
     *
     * @param Member $user
     * @param array $options
     */
    public function initialize($user, $options)
    {
        for ($i = 1; $i <= MEMBER_BULK_ADD_COUNT; $i++) {
            $fname = new Text("member_first_name_$i", array('maxlength' => 30 ));
            $this->add($fname);
            $lname = new Text("member_last_name_$i", array('maxlength' => 30 ));
            $this->add($lname);
        }
        $submit = new Submit("submit");
        $this->add($submit);
    }
}
Thanks