ProtonBank have any relation with ProtonMail very similar name so that I think Protein Bank sound more attractive which has real use case when you will provide that through smart contract.
No, we have no relation with ProtonMail. Similarly though, they provide a Anonymous way to send email, and we provide a anonymous way to invest in Crypto Currency assets without managing trades yourself. I believe this is why we leaned towards the name of ProtonBank.
I will take your note into consideration if it becomes a problem. Thanks for the comment.
I don't think you can trademark "Proton"
The logo design and other things would have to come into play.
Haha ProtonBank, NeutronBank, and Electron Bank
AtomBank