Help! With baby names!

Tiffany • Vegas Native ✨ | LEOW 💙 | Mom of 3 👧🏼👦🏼👧🏼| Home and Natural Birth Advocate 💕
Ok, so we have a few front runners for our baby girl. Last name is Harding! :) 
London (Elizabeth or Grace for middle name)
Sloane 
Reagan 
The thing with London is we always have loved it. But now we know we're having a girl, it's suddenly not as big of a contender for me. Hubs still likes it! 
Sloane, I've never met one! I like it but I'm not sure if it sounds the best with our last name.
The problem with Reagan is we have some well, I guess aquaintences that have a young daughter named Reagan. Would it be weird to name our daughter that? She's a pastors kid at our church so a lot of people know of her. Should we ask permission? 
I would love suggestions for middle names or maybe variations of those names! Or pros and cons if you've met someone with those names! :)