Earlier quoted context omitted.
They already do this based on names. A former coworker shared his name with his grandfather, and both of them matched the name of a man on the terror watchlist. Naturally, the man was much younger than both of them and of a different nationality, but that didn't stop his grandfather (~50 years older!) from getting stopped and questioned every time he flew.
I was wondering about this. From what I hear it's basically impossible to get a name removed from this watchlist, so short of actually legally changing your name there's basically nothing you can do!?
Shh! Don't let the terrorists know!