I think a mascot's name should be short and easy to remember. SJ Sharkie is as easy as it gets to remember, but even I'll admit it's not very creative. Sharkie is definitely the best mascot though, he just looks like the coolest shark you've ever met (yes I know what I said). I want to meet him.
I think Stanley C. Panther or whatever it is has to be the worst. It's 50% unoriginal, 50% too long and 100% lame.