My favorite is [name_f]Claire[/name_f], but I do like the suggestion of [name_f]Clara[/name_f].
My second choice would be [name_f]Sarah[/name_f], but spelled [name_f]Sara[/name_f].
I’m not a fan of [name_f]Mila[/name_f] & [name_f]Eva[/name_f], & [name_f]Ellie[/name_f] does seem to be more of a nn than a full name. [name_f]Anna[/name_f] & [name_f]Ella[/name_f] are too match-y to my eye/ear, but [name_f]Anna[/name_f] & [name_f]Eleanor[/name_f] are classics that go together well [name_f]IMO[/name_f].
Good luck! 