Another flyboy candidate: Chuck Yeager. His tale of being shot down over France, making his way to Spain and then back to England, talking Eisenhower into letting him fly again, etc. would make one heckuva movie. And that’s practically nothing compared to a lot of other things he did.
I’d vote John Daly.
Samuel R. Delany. He throws out incredible insights whenever he speaks.
Second choice is Darrell Schweitzer. For the same reason. Listening to him is fascinating.
I have to agree with you here. The most interesting people I’ve ever talked to have been: an autistic savant – he explained to me how he was now taking out the garbage for collection of the garbage from 370 days from now- he’d improved his methods so much that he was over a year ahead in his chore! He worked as a mail sorter and could tell you how many letters he’d handled today, this week/year/since he started as well as tell you some of the more interesting addresses he’d seen, etc. To begin to understand such a life and a mind was far more than just the “party game” tricks as his whole life revolved around his optimizing processes and looking for patterns, numbers, logic.
And the second was a professor I had in college, who similarly just knew things. She was trying to peg down my accent so I said my hometown and she asked me all sorts of questions about the parks, the economy, history, but she knew most of it already, because although she’d never been there she’d “read an article 10 years earlier and pulled up a map at that time”. She then went to the guy next to me from New Orleans and after he mentioned his street corner, she described his house and the paint color.
And in this exercise, I have discovered that I think people with incredible memories and minds are the most fascinating.
I’m glad I enjoy my humor, because otherwise nobody would. 
He would have been a good candidate, but he passed away in 2015.
I don’t know whether Elon Musk is deeply interesting himself, but he does interesting things. Richard Branson is at least moderately interesting.
I don’t know whether the OP was deliberately selecting only those with a Y chromosome but I reckon Elizabeth Windsor might be somewhere near the top of an “interesting person” list.
Even the blind can recognize a Natty Lite by smell alone.
I wondered if this is the case. I hope that the OP will come back and clarify, and provide a reason for either excluding them or ignoring them.
Its a reference to the Dos Esquis ‘Most Interesting Man in the World’ ads I believe:
I thought we’d agreed that Coldfire was TMIMITW.
We can include women as well, but since Dos Equis was running this particular ad, (Most Interesting Man in the World,) I was asking about that.
Sure, there are things which non US residents don’t get the context, but when you quote something like that then people may make assumptions about you.
Peter Sagal
It is quite possible that the most interesting man in the world is someone who we could not possibly know about. In the sense that the most interesting rat in the world is very unlikely to be a rat that has learned to run through a laboratory maze, but rather one that knows how to live in the wild according to rules without a safety net. The most interesting man in the world might be someone like Xi, the San boy from the film “The Gods Must Be Crazy”. But he can’t tell us.
In my own experience, the two most interesting Americans I’ve ever met were a 16-year-old Crow boy hitchhiking out of Wolf Point, Montana, and a police officer on the Blackfeet reservation at Browning, Montana. I had the chance to have an unhurried chat for several hours with each of them, mostly just listening, as they talked about life as an American still steeped in their pre-literate worldview.
They could only speak to me in English, of course, about things there are words for in English, which severely limited all that they could have said. The young boy has owned his own horses since he was ten, and several times a year just gets aboard one bareback and rides off into the Big Horns for a week at a time,summer or winter, and lives off the land, unencumbered by anything you can buy at WalMart… How many presidents and poets and professors have done anything outside the box of western culture, just running the maze that has replaced their nature?
The mosst interesting man in the world is limited by what I can understand him to talk about.
It also depends on how you personally define ‘interesting’, what is interesting to one person is utterly uninteresting and mudane to another.
I like to read in my spare time and chat with friends online while other people like to go out and party at clubs, I find their hobby uninteresting as they most likely do mine.
Harlan Ellison is probably the most interesting person you’ll ever actually talk to, unfortunately he goes out of his way to be a real troll just about every place else.