Multiple 'No Name' contacts showing up in Address Book
Recently some OS X users have experienced problems in which their contact lists end up getting a number of No Name vCard entries. When this problem happens, these entries seem to accumulate over time to the point where thousands will fill the Address Book. In addition, the entries also show up on iOS devices that are being synced to the Mac.
One user on the Apple Discussion Communities suggested the issue may be from a MobileMe server error, as he was informed of by MobileMe support, so if you are experiencing this issue you might try contacting Apple's support … Read more