Name for baby girl! Help!

Nicole • Hi I'm Stephanie. 24, mom of 3 girls (4,3,1) and pregnant with our 4th.
I'm really stuck on picking a name for our fourth daughter. We can't agree on anything. He loves the name Sofia but my cousins daughters name is Sofia. I would agree to Sophie as a name though. We also are tossing around the name Keiran but can't decide. Help!