I started a site for a friend, in my name, and with my email address, and then was able to transfer the ownership to her by going to "edit" > "dashboard" > under maintenance "change main person" > and then changing name and email address.
This was some time ago and I remember trying a few times and then a message came up something along the lines of asking if I wanted to change the owner. A bit hazy for me now to recall exactly but it worked.