Question: My sister just called me at work. She's home sick, watching Get Smart, and wants to know what Agent 99's name was. We know, obviously, that Agent 86's was Maxwell Smart. Was 99's ever stated on the show? I seem to remember Max always calling her 99.
Answer: Would you believe it was never revealed? (Sorry, nearly every time I write about Get Smart I have to start off with that famous Maxwell Smart utterance.) Truth is, though, that even Max (Don Adams) knew her only by her CONTROL number despite eventually marrying and fathering a set of twins with his beautiful partner (Barbara Feldon).
In one episode, in which 99 quit CONTROL, she said her name was Susan Hilton. By the end of it, however, she admitted that was a false name. She'd merely sorry, I can't resist pulled a number on us.