Can't decide on baby girls name....

Emily
DH and I can't agree on our baby's name. I am 31 weeks and I feel horrible that we keep calling her she/her/baby girl/etc. Part of the problem is that I have such a huge family, that it's hard to come up with a name that someone doesn't have. Also, I love the name Harper and keep going back to it, but my future SIL has always loved that name and I don't feel right "stealing" it from her. So any suggestions would be appreciated!!! Our oldest daughters name is Avery Reese and last name starts with a F. 
HELP!!!!