Baby girl name help!

We had a name picked out since we found out the gender. and some people said it didn't fit with our last name. We wanted to name our girl Annabelle, but our last name is Ellis. They said it sounded off, Annabelle Ellis.

We have been struggling to come up with a name that my husband and I both like. We both love Olivia, however my sister has already claimed the name and been talking about their future kids, they have two now and possibly want 4 and are currently ttc. Even today said their future daughters stocking will have an O on it for Olivia. She knows it's in our top list. We even had it on our top list for our son had he been a girl, but we chose to not share any potential names with family. She knows we did now bc Ive been sharing name ideas with her and she said we could use it bc she doesn't know if she will have anymore girls. We love the name but I feel if we picked it she would hold it against us forever, even though she said it's ok. I just feel it's not fair she's claimed it the way she has.

The names were currently debating are: Chloe, Ava, Isla, and Isabelle(however same issue as Annabelle but my husband is kind of like it doesn't matter how it sounds now, but it bothers me) I'm really at a loss and not sure what to do. I'm dialated to almost 2cm and 70% effaced, and the doctors are concerned I could have her anytime. If anyone has an input or other similar name suggestions we would really appreciate it. I'm panicking now that we don't have a name.