Google requires that you put your legal name in your profile. No incomplete names or pseudonyms.
They also require that you have a name consisting of a first name and surname.
They will suspend profiles of anyone who does not obey the above restrictions, locking you out of the system. This will also break other Google services such as Latitude. All it takes is one person to report the profile.
This is in direct contravention of one of their stated policy positions.