It was not until French colonists brought the game across the Atlantic in the early 1800s that Vingt-et-Un would become Blackjack.
While Ving-et-Un did not gain momentum in France in the early 1900s, it rapidly became popular and spread across North America. Americans initially played Vingt-et-Un according to the British rules, but altered the game rules and renamed it Blackjack towards the end of the 1890s.
For a long time, it was believed Nevada's casinos renamed Vingt-et-Un Blackjack. According to this theory, Nevada casinos added a hand with a ten-to-one payout ratio to draw more players to their floors. This hand comprised the Ace of spades and a black Jack.
This theory has since been debunked by the French historian, Thierry Depaulis, whose research suggests that Ving-et-Un was named Blackjack by prospectors during the Klondike Gold Rush.
Since the term "blackjack" was used to refer to the mineral Sphalerite, which was associated with gold and silver deposits, Depaulis suggests that prospectors used the term to describe a natural blackjack hand. Either way, the term Blackjack was indeed coined in North America towards the end of the 1800s.