I clicked on your profile to see if it listed your names, since your last name is clearly in your SN and your siggy. It did, but I have to say, love those comments under your story too! Very amusing!
In all seriousness, you should probably get a new screenname that has nothing to do with first/last names, and don't put up giant flashing siggies of what your name will be.
Also, for your new SN, you can change your profile pic by clicking on 'change avatar' under community links on the left hand side bar. Since you asked.