Good evening and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
For starters, I would recommend heading over to https://theeventscalendar.com/my-account/ and changing your billing details there to make sure future orders reflect the desired Billing name.
However to modify the order’s billing name, you will need to submit the desired name change through a private reply in this thread. We will gladly change it for you.
Best regards,
Geoff B.