I searched through the Prefect Cloud documentation and unfortunately, there isn't any direct information about renaming a Prefect Cloud account. Typically, changing the name of an account involves settings that would be accessed by the account's admin under account settings.
Since this specific function may not be commonly documented, I recommend you directly reach out to Prefect support for assistance on this matter or check your account settings if you have admin access. If you have admin rights, you could look for an option to modify the account information from there.
In the meantime, would you like me to help with how to reach out to Prefect support or any other assistance related to Prefect Cloud?