Knowledgebase: Google
Contact names are limited to 255 characters
Posted by - NA - on 29 June 2009 01:30 PM
Google:

Contact names are limited to 255 characters. If the name is larger it is not truncated and does not get inserted into the database.  Since it is not found in the database, each PIM cycle views the contact as a new item.  This results in multiple copies of the contact on the device.