Some rarer ones I think will sound wonderful next to sis’s name (which I LOVE, by the way). I would go with [name_f]Arista[/name_f] or [name_f]Petra[/name_f] from your list.
[name_f]Nairne[/name_f]
[name_f]Faine[/name_f] (unsure how you feel about to F-initial names)
Lunneth
[name_f]Ellorie[/name_f]
[name_f]Ivette[/name_f]
[name_f]Nairi[/name_f]
[name_f]Zosia[/name_f]
[name_f]Nolwenn[/name_f]
[name_f]Liora[/name_f]
[name_f]Hope[/name_f] these help! 