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Dans votre classes classes/Validate.php - soit dans le code original, soit dans une override, ajoutez cette fonction

    public static function isCustomerName($name)
    {
        if (preg_match(Tools::cleanNonUnicodeSupport('/www|http/ui'),$name))
           return false;

        return preg_match(Tools::cleanNonUnicodeSupport('/^[^0-9!\[\]<>,;?=+()@#"°{}_$%:\/\\\*\^]*$/u'), $name);
    }

Modifiez ensuite dans classes/Customer.php

            'lastname' =>                    array('type' => self::TYPE_STRING, 'validate' => 'isName', 'required' => true, 'size' => 32),
            'firstname' =>                    array('type' => self::TYPE_STRING, 'validate' => 'isName', 'required' => true, 'size' => 32),

par

            'lastname' =>                    array('type' => self::TYPE_STRING, 'validate' => 'isCustomerName', 'required' => true, 'size' => 32),
            'firstname' =>                    array('type' => self::TYPE_STRING, 'validate' => 'isCustomerName', 'required' => true, 'size' => 32),