A real mix of name styles here!
Juliet (this simpler spelling) is stunning and my favourite .Alana, Celia and Cassandra are also beautiful. All are underused, feminine and elegant imo.
Genevieve, Arabella, Isabelle and Elena are nice enough, if more popular .
Your other choices I find very trendy - especially Harper, Sienna, Cassidy etc and I’m not sure they will age well (Samantha, Josie and Gabrielle are already possibly a bit dated?).