I voted for [name_f]Charlotte[/name_f] [name_f]Isobel[/name_f] [name_f]Sunday[/name_f] (love this one!), [name_f]Charlotte[/name_f] [name_f]Rose[/name_f] [name_f]Clementine[/name_f], and [name_f]Charlotte[/name_f] [name_f]Vivienne[/name_f] [name_f]Maple[/name_f]. I like the more modern, spunky second middles to balance out how classic/vintage your other choices are. I also enjoy [name_f]Charlotte[/name_f] [name_f]Lavender[/name_f] [name_f]Rose[/name_f], but something about having two flower names right next to each other kind of bothers me. That said, I’m just one very unimportant person and it sounds lovely.
[name_f]Charlotte[/name_f] [name_f]Lavender[/name_f] [name_f]Mabel[/name_f] and [name_f]Charlotte[/name_f] [name_f]Rose[/name_f] [name_f]Mabel[/name_f] are gorgeous! I also love all four [name_f]Charlotte[/name_f] [name_f]Vivienne[/name_f] combos; my favorite being [name_f]Charlotte[/name_f] [name_f]Vivienne[/name_f] [name_f]Azure[/name_f]–so unexpected and evokes beautiful imagery.
I voted for [name_f]Charlotte[/name_f] [name_f]Lavender[/name_f] [name_f]Rose[/name_f] because it is the only one which flows smoothly and easily for me, but I agree with @laugre that [name_f]Charlotte[/name_f] [name_f]Vivienne[/name_f] [name_f]Rose[/name_f] would be exquisite, as would [name_f]Charlotte[/name_f] [name_f]Isobel[/name_f] [name_f]Rose[/name_f]. All three have the same 2~3~1 Syllable pattern which flows really nicely!