Most card games don't really have a specific point in time when they ware created and blackjack is no exception. The history of blackjack is a lot like the history of any other classic card game. It has a predecesor that was invented in either Spain or France around the 17th century and then exported into America where it evolved into what it is today.
So the whole thing probably started with a game called Twenty-one. It was played with a few different rules than todays blackjack and it was also played with an incomplete deck. The name Blackjack actually formed after it's arrival into America. Casinos back then offered a bonus to whoever got the Ace of Spades combined with one of the black Jacks. The bonus was called Blackjack and was later removed, but the name stuck around.
The more modern history of the game is actually a lot more interesting. Since it's a beatable game there have been some pretty spectacular attempts at taking down the house. I'm sure everyone has seen the movie 21 about some collage kids taking down the big casinos in Vegas, but there are many other famous gamblers that have their own stories to tell. Here are a few of them:
Kerry Packer: One of the most-told stories was when a Texas oil tycoon was mouthing off to him and said, “You know who I am partner? I’m worth $60 million!” Packer then pulled out a coin and said, “I’ll flip you for it.”
Edward Thorp: Thorp is credited with inventing the modern card counting system that blackjack pros have used to make huge profits.
Bill Kaplan and J.P. Massar: Bill Kaplan and J.P. Massar formed the basis for what would become the most famous card counting team in history – the MIT Blackjack Team.
You can find the full stories and many more plus some more blackjack history at Blackjacklife.com. Definatly an interesting read.
Need more history? Check out how Blackjack came to be here.