You’ll want to read the var dump types to determine how to access the data structure. If it says object (e.g., in your dump it first lists object(stdClass)#13), then you’ll use -> operator to access the listed elements (e.g., $object->contact). If it says array, you can use index notation [0] or, if more than one element, iterate with a loop construct:
foreach ($object->contact as $contact) {
    foreach ($contact->fields as $field) {
        if ($field->type == 'name') {
            echo $field->value->givenName, ' ', echo $field->value->middleName;
        }
    }
}
solved Read var_dump data with PHP