within your class classes/Validate.php - either in the native code, or into an override, add this function 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); } Then modify inside classes/Customer.php 'lastname' => array('type