If From Name is unspecified, all email notifications will use your Client Name in its place. You can customize the default From Name by adding this to your core config.php:

$GLOBALS['LIVEWHALE_CONFIG']['FROM_NAME']='Website Notification';

Note: in certain contexts like event RSVPs, the From Name will be replaced by the email address of the event organizer – in such cases, that email will also be set as the Reply-To address, so registrants can reply to the confirmation email and reach the event organizer. To override this behavior, enable ALWAYS_USE_FROM_NAME.