Hey - for some context, when you create a Cash App account and proceed with verification, you will have to provide identification with your legal name to verify your account. However, that info is not public. That said, your Cash App display name is public and can be seen by anyone.
If you are interested in changing the display name on your account so that it doesn't reflect your legal name, you can change it directly from the app. You display name will show up on his bank statement. If you like assistance on how to change your display name, feel free to send me a PM.