After 3 weeks of Google+ they deactivated my Google+ profile because I don’t use my real name.
Update, 2011-07-25: After changing my name into Theodor Fuchs my account has been reactivated within an hour. That’s not my real name but it seems real for Google.
Update, 2014-07-16: Google writing at their Google+ profile:
Today, we are taking the last step: there are no more restrictions on what name you can use.
Update, 2014-09-22: I discovered a useful online-tool to generate fake names: fakena.me. I don’t know if it works for Google.
Update, 2015-05-28: I deleted my Google+ Profile. You won’t find me anymore on Google+.