By default, there is no From Name in the auto-resopnse email message. User will see your form's email address in the From field. If you want to set something like "Sales <sales@yourwebsite.com>" for the auto-response email message, you can check out the options when you create or edit form :
1) click option : Customize email & auto-response message 2) then click option : More auto-response options
See screen shot below for details :
or edit form.lib.php directly, for example :
// for auto-response email
define( 'PHPFMG_YOUR_NAME' , 'Sales' ); // name of auto-response mail address