Sure, just try exporting any contact with a double name from the table found at: http://www.bo.ingv.it/contents/INGV-Bologna/Staff.html when added in OS X Address Book such contacts have an empty name; while exporting them to yahoo contacts works correctly. ...not sure it's an OS X bug though, since even in Operator's Debug tab family-name and given-name are missing for such contacts. >If you could out a testcase up, that would be great.