How do I change the owner name on my MacBook Pro? When I use Terminal my computer says

Last login: Thu Jun  7 22:00:00 on ttys000
John-Does-MacBook-Pro:~ John$ 


That was the default account name on the computer when I bought it. I have been using it for 2 weeks now and I am pretty much set with the OS and I really don't want to do a reinstall. I deleted the John Doe account but that did nothing.

How do I change my Terminal so it doesn't display that any more?
In System Preferences, go to Sharing and change the name at the top of the window.