To figure the right answer to your question like What Bank Name Is Cash App, you have to first go to Cash App help section where you will get to know the name of the banking institutes that Cash App is using to put forward online banking solution for its all users. On the other hand, if you have any doubts, you can try approach the Cash App support engineers without making any delay.
https://www.square-cash-app.com/blog/what-is-cash-app-bank-name/