I can understand creating an online blackjack variation named for Atlantic City. After Las Vegas it is the biggest city in the United States for casinos. And we do have an online blackjack variation called Vegas Strip Blackjack, named so for Las Vegas. So I suppose Atlantic City Blackjack does not surprise me now that it has shown up in the online casino world: Atlantic City Blackjack has recently been released by Cyrptologic to some of their partner online casinos.
Now while I am not a fan of blackjack variations, I will admit that Vegas Strip Blackjack is not too bad of a variation. This comes from the fact that the dealer will peek to see if he has blackjack when he has a ten-value card or Ace showing; this increases your blackjack odds since not peeking increases the house