you didn't supply a great deal of information about your wireless router so I can only be generic.
You will need to access the wireless router in the same way as you did when you first set up the wireless networks.
Once there, navigate to the Guest Network setup where you should see the SSID field (this is where your name is coming from)
Change the name of Guest Network from your name to something more suitable and save the changes.
The wireless router will probably automatically restart itself to make the changes permanent.
Unless you specifically want to have a Guest network, you could always turn it off. That option will be in the setup somewhere.
Hope that helps.
I inadvertently created a "Guest" wireless network account using my full name which is currently being broadcasted in my neighborhood. Of course I am concerned about having my full name out in public. I have my home personal network and would like to create a "Guest" network (minus my full name). Can someone walk me through the steps to get rid of my mistake? Thanks so much!