Name Help

Melissa • First Glow baby in December 2016, just found out I'm pregnant again and due in March 2019.
My husband and I decided on our baby names a long time ago (boy the first day we ever talked and girl at least a year ago). We find out the gender on Friday and we are so excited, but I'm worried about his family being angry about our name choices. They'll be mad about the boy name regardless because it is a Greek mythological name and they are super Christian, but I'm more worried about the girl. The girl name is Iris Elizabeth Hodge. I love the name so much and am using Elizabeth as a nod to my good friend. The problem is that twelve years ago, my husband's brother had a daughter named Elizabeth, but after abusing her for a few years, he gave up custody and abandoned her. He hasn't seen her since then, but my husband's parents see her occasionally and have a relationship with her. There are A LOT of issues between my husband's brother and me (mainly because he tried to sleep with me) and I KNOW he will try and make this a big deal, but honestly, it's hard to even remember he has an older daughter except when he lies and pretends to be some noble father. My husband has told me that he couldn't care less what his brother thinks about our babys name, and I don't think I could ever find another name to replace it, but I am just so tired of the drama with his brother! Should I just keep my name the way I want it or try and prevent another blow down drag out with his brother?