Change name after invoice is being send

Hi,
After I have made and emailed it to the custommer through the backend. I want to change the name on the invoice (with the same invoice number). Unfortunately, the invoice can not be updated. Any solution?

E.g.: a custommer says, How I need the invoice on my company’s name, after you have sent it to him, but you can’t change the name anymore…

Thank you for the reply.

Regards,
Filip