Another vote for [name_f]Katerina[/name_f] [name_f]Ivy[/name_f]!
Katerina and [name_f]Ivy[/name_f] both feel familiar, yet very underused. I love the nickname [name_f]Kat[/name_f] and [name_f]Katerina[/name_f] sounds royal without being pompous. I think [name_f]Ivy[/name_f] is an undiscovered gem of a middle name. I also like the subtle link between your daughters names by both having plants in the middle spot - I even feel like plant is more subtle than flower so it makes me like it even more.
I like [name_f]Arabella[/name_f] (again, familiar but underused), but [name_f]Jane[/name_f] will always feel too plain to me. Despite only knowing one [name_f]Jane[/name_f] in real life, the common use of [name_f]Jane[/name_f] as a character/placeholder name makes it feel very overused to me.
Octavia just isn’t for me - it feels too heavy somehow (if that makes sense). [name_u]Rain[/name_u] is also one of the word names I personally despise, though I do very much appreciate that you’ve spelled it correctly at least!
And for [name_f]Sienna[/name_f] [name_f]Violet[/name_f], I just can’t get onboard with two colours as a name. I’ve also seen [name_f]Violet[/name_f] misheard and spelled as Violent instead and am concerned by that.