You can create G+ account under any random, but plausible looking name. You can be 15 year French old girl and call yourself "George Bush" (there are already 3 of those on G+). It's not like Google requires valid proof of identity to sign up.
Do people, including Danah Boyd, do not realize that? Given that in practice G+ has anonymous accounts, what is the fuss about?
I understand that Google officially won't acknowledge that but the "no anonymity" is just posturing. They have no practical way and probably no intention of making sure that people provide the real names.
So the issue here seems to be not about anonymity but about being obvious about being anonymous and the many justifications given in favor of anonymity do not carry over.