I have watched the movie Deadpool. I found the name quite interesting and read the following article about its origin.
As explained in the movie, Deadpool takes his name from the “dead pool” at the seedy mercenary bar he frequents. Though the term usually refers to a group bet on which celebrity will die next, the film makes it seem like this particular dead pool is limited to the ruthless patrons of Sister Margaret’s Home For Wayward Girls bar, with the joke being that assassinating people is a dangerous line of work so they’re all betting on which one of them will be killed first. But it turns out that’s not the case at all. A handy screenshot of the bar reveals most people have selected real-life celebrities, and Weasel and Wade Wilson are the only two weirdos who have bet on people they know (as referenced in the film, Weasel bets on Wade while Wade bets on a fellow assassin named “J. Boothe”).
-- Source: All the names on Deadpool’s dead pool
In the movie, Wade Wilson is named Dead Pool. His tough friend Weasel and the cab driver call him Mr Pool, which makes me wonder why the title of the movie is Deadpool, not Dead Pool.
Why does Deadpool get compounded here? To make it sound more pretentious or what?