Just to expand a little, the opposite situation can also be a problem. My son is xxx, III. When he registered originally, he registered yyy xxxx where yyy was a nickname. A problem arose where both of us travelled together intenationally. He had to get OnePass to change his registered name to xxxx, III (so that it would correspond to his passport) and then I had to make sure that the reservaions were clearly listed as both xxxx and xxxx,III (so that the res system recognized it as two different people travelling together and not cancel one of them as a duplication).