For what it's worth -
A Google support worker has stated:
Google Profiles is a product that works best in the identified state. This way you can be certain you’re connecting with the right person, and others will have confidence knowing that there is someone real behind the profile they’re checking out. For this reason, Google Profiles requires you to use the name that you commonly go by in daily life.In August 2011, Google CEO Eric Schmidt was quoted as stating that Google+ was intended as an identity management service more than as a social network, and that the use of real names would be necessary for other planned Google products based on this service. He also asserted that "the Internet will work better if people know that you're a real person rather than a fake person".