Some of these are gorgeous… [name_f]Serena[/name_f] [name_f]Estelle[/name_f], [name_f]Iris[/name_f] [name_f]Valentina[/name_f], [name_f]Alaira[/name_f] [name_f]Isabel[/name_f], [name_f]Nora[/name_f] [name_f]Leota[/name_f] 
I don’t like [name_m]Randall[/name_m] for a girl. But other than that they all work.
For sibling sets, I like [name_f]Nora[/name_f] [name_f]Leota[/name_f] with [name_f]Iris[/name_f] [name_f]Valentina[/name_f], and [name_f]Sarah[/name_f] [name_f]Elizabeth[/name_f] with [name_f]Maria[/name_f] [name_f]Susanna[/name_f].
With your list, I would recommend:
[name_f]Irene[/name_f]
[name_f]Elise[/name_f]
[name_f]Leonora[/name_f]
[name_f]Serenity[/name_f]
[name_f]Stella[/name_f]
[name_f]Kendall[/name_f]
[name_f]Ariel[/name_f]
[name_f]Reina[/name_f]
[name_f]Miranda[/name_f]
[name_f]Sophie[/name_f]
[name_f]Sophia[/name_f]
[name_f]Isabella[/name_f]
[name_f]Suzette[/name_f]
[name_f]Adriana[/name_f]
[name_f]Lauren[/name_f]
[name_f]Leona[/name_f]