Faites vos jeux.  That's French for place your bets,  and it's something you'll hear croupiers say at the beginning of every round in a French casino. You can pick up a lot of French from roulette betting terms, and it's interesting to learn how to place the bets too.
While the popularity of Blackjack dates from World War I, its roots go back to the 1760s in France, where it is called Vingt-et-Un (French for 21). Today, Blackjack is the one card game that can be found in every American casino.