Well, "Under CAPPS II, airlines will ask passengers for a slightly expanded amount of reservation information, including full name, date of birth, home address, and home telephone number" but it has not yet been implemented. And although the US and the EU have reached detente on PNR information exchange, the full name is not part of the Schedule A information although what is will probably astound several folks out there. I don't believe full names is a DHS requirement as of today, and I would speculate that it is a systems requirement that the US airlines are putting in place in anticipation of CAPPS II going live.