The de-facto rule is 'your real name' since they ask for government ID in case your profile gets flagged: "Please select a clear, readable copy of your valid driver's license, national ID card, or other photo ID. Our team will not take action if you send a photo of anything other than your ID card." (from https://www.google.com/support/accounts/bin/request.py?conta... ).
"we need to verify that your identity matches the one on the profile"
That doesn't necessarily mean that the profile has your [full] legal name attached to it just that it is properly associated with you. YMMV and probably will.
