Hi there, @Patty04.
Let me help you modify the client's name on the PDF attachment.
Are you referring to the PDF attachment when sending an email confirmation for the payment you've received? If so, currently, there's no direct way to modify the exact PDF.
However, you can always go back to the Invoice or Payment Receipt and review how the information is entered under the Bill To section.
Please make sure that the name of your client under Bill To section is not repeatedly entered. I've attached a screenshot below for your reference.
Once completed, you can resend the payment receipt with accurate information.
That's it! Feel free to leave a comment below if you're referring to something else or if you have any other questions.