Alright, so I've come to a proper decision. Joseph's obscenely rich maternal grandparents are the Johannsens. I saw it on a street sign recently and thought that it might make a nice name, but then I had second thoughts when I realised that it also started with a 'Jo', and it might not mesh properly with the name Joseph. About a second later though, I realised that would make Joseph a Jojo, and therefore I didn't actually have a choice anymore!