Our WiFI pword is both alphanumerical, easy to remember and able to turned easily into Hex. You have to know where we were married (ownership and name changed more than once since then) to have any chance at it. I doubt anyone else there remembers and it was in Southern NZ. The router is in Dundee.
I jokingly tell people the passcode for my tablet is my phone number from the mid-60's. There's all of four people besides myself who might still remember it (and it wasn't under my name). Any malevolent party trying to access it would have to do WAY more research than it would be worth to find that.