As others have noted, you don't have to answer. Now as to:
There are so many options to choose from:
1) it makes them feel important; :rolleyes:
2) they're bored;
3) they're hoping to catch you in a lie and go on to prove that you're really OBL; :rolleyes::rolleyes::rolleyes:
4) you've got an unusual name and they wanted to know how it's pronounced (it's happened before, but it doesn't explain why they'd ask everyone);
5) they were flirting with you (might not explain why they'd ask everyone, but then again...);
6) - 100) [feel free to make up another 95 'reasons'].

The bottom line is,

a) TSA doesn't need to know ANYONE's name; they just need to make sure passengers aren't carrying weapons or explosives and
b) your name (or whatever name you chose to use that day ;)) was printed on two pieces of paper in front of them.

No requirement to communicate verbally. Hand them a printed piece of paper with your name high lighted, i.e. a copy of your BP.

Yall are fantastic. I wouldn't want to be up against ANY of yall in a court of law!! :D

I have decided on my standard line if asked this question again:

"My name is clearly printed on both my boarding pass and my government issued photo ID. I am under no obligation to communicate with you verbally."

12345

I'd so be tempted to say "Osama bin Laden" just to see the reaction.

Then again, I'd have to make sure I were traveling alone. My wife wouldn't appreciate the likely show.

I did something like this once. A TDC smurf asked my name, and I leaned over, looked at the boarding pass in his hand, and read the name on it (my name, of course). But I acted like I needed to read the boarding pass to answer his question. It was very disconcerting to him. Eventually, he discerned that I was trying to push his buttons and stopped playing.

Bruce

Even more effective if that answer was given by a woman in her 20's.

My name is "SPOT"!

I'm probably too sheepish to try anything like this.

But if there are other ways to passively push-back against this without coming across as a jerk ...

"My name is [whatever]. May I ask your name, please?"

Or, if you've got a great sense of humor ...

"My name is [whatever]. I represent the Acme Insurance Company of Delevan, Indiana. Let me ask you a question. Do you feel confident that your house is adequately insured against natural disasters? I have an interesting opportunity for you that would help bring you a great deal of piece of mind ..."

I thought it was Walla Walla Washington or Hackensack, NJ. :D

This one is brilliant!

At the TDC my name is (when asked): May I go now?

I am hearing impaired and the noisy check point areas are hard enough without being SPOTted.

If the TDC persists, I simply say, because it is true, "I am hearing impaired and I did not understand you." I put on my best forlorn puppy dog look.

Every time the answer has been some version of "Have a nice flight."

Thanks Superguy! I love Ron White and that was priceless.

Remember to keep it "formal" and say Terrence Wrist ;).