Skyler Elizabeth - I prefer the spelling Skylar, and think a simpler mn would suit better - like Skyler Eve
Sienna Grace - as others have said, quite common - esp Grace as a mn. It does go with everything though!
Sophia Alessandra - I think Sophie Alessandra flows better. Gorgeous names!
Charlotte Isabella - both too common for my liking
Cassandra Abigail - nice! I also like the name Casuarina (with nn Cass/Cassie)
Peyton Rose - LOVE Peyton! Rose goes well! Some other mn suggestions: Abigail, Elizabeth, Aurelia
Chloe Valentina - lovely!
Evie Aurelia I think Aurelia Eve flows better. I also dont like Evie as a first name - ok as a nn (I have an Evie whose name is Evangeline)

Alexander Jacob
Xander Jacob
Dominic Hunter
Asher Thomas
Gabriel Thomas
Micah James

will be back to give my 2c on the boys!