the coin is just free ware open source. visa has noone to sue. its all p2p decentralized
So it will be Napster all over again and Visa will sue ISPs that allow users to run the Visa client (or even Bitcoin QT) and then ISPs will start shutting down users. The protocol doesn't need the added heartache just pick a name that isn't a blatant rip off of an existing established payment processor.
You may as well call it US Dollar coin and call yourself the US Federal Reserve Bank and see how much shit you can cause for the community.