You can change the name on your billing invoice by updating your Profile name and then downloading a fresh PDF from the Billing Information area. Here's an article about how to download invoices.
How to Change Your Profile Name
Select Profile and Settings from the navigation menu on the left.
2. Go to Profile Information.
3. Change the name to the one you want on your invoice, then click Save.
4. Download your invoice from the Billing Information area and see the new "Bill to" name.