Hello, In my passport SurName is empty and GivenName is xxxx yyyyy. When i applied for green card , i had given First Name : xxxx yyyyy and Last Name : LNU. (My SSN , Employment , Bank Accounts etc are in this format) . My EAD and AP has name as LNU, xxxx yyyyy. Will there be any problem if i travel abroad?. Will the port of entry people mistake LNU as my last name and tell that the name in passport and AP doesn't match?. Please let me know. Also, I remember seeing one PDF article from USCIS or DOL which tells about the usage of LNU and FNU. Do anyone has a copy of it ? Or Help me to locate it ?. Thanks.