The boys names could have been mine! Milo Emmanuel was my top Milo combo for a long time, I think it's very sweet. I never thought about Gideon and Ambrose together, I like it. Don't know about Nightingale, but I think I really like Aviva. And Aurelia Clementine is beautiful. But, where are you putting the emphasis with Aurelia? If it's on the LEE, Lia makes sense. I'm pronouncing it ah-REL-ya, and if it were me I would call her that most of the time, and Rel when I'm in a hurry, despite how ugly Rel is on its own.
Sunniva Seraphina "Evie" is very pretty.