Comic book fans have expressed frustration that while every other Batman character has the same name we know from the comics, Poison Ivy stands out because she is named Ivy Pepper, not Pamela Isley. I asked Heller why that is and he gave me an answer he cautioned did delve into spoilers.
"Its really about being able to tell the secret histories of these stories. If you just re-tell stories exactly as theyve been told before, whilst youre being true to the created mythology, youre not really adding anything to it. So you have to find ways of finding more. And in this case, weve set up a situation in which Ivy Pepper, her mom is sick, her dad is dead
Shes going to go to the orphanage. And shes a nice young girl; relatively undamaged. And she will find people to adopt her. And then we will start on the Poison Ivy story that people are familiar with."
While Heller didn't elaborate from there, there's some pretty obvious guesses one could make about Ivy Pepper's name possibly being changed by her new adoptive parents... and then her eventually reclaiming the name Ivy down the line in a dramatic manner.
http://www.ign.com/articles/2014/07...joker-rumors-and-why-poison-ivy-is-ivy-pepper