I think [name_f]Francesca[/name_f] [name_f]Ann[/name_f] might be a bit of a mouthful with the double up of the “an” sound.
I think [name_f]Francesca[/name_f] [name_f]Louise[/name_f] would work nicely with [name_m]Aidan[/name_m] [name_m]James[/name_m] & [name_f]Ivy[/name_f] [name_f]Rebecca[/name_f].
I actually think [name_m]Aidan[/name_m], [name_f]Ivy[/name_f] & [name_f]Freya[/name_f] would be the least disjointed sibset, because [name_m]Aidan[/name_m] & [name_f]Freya[/name_f] both have a Celtic influence and [name_f]Ivy[/name_f] & [name_f]Freya[/name_f] are both popular [name_f]British[/name_f] names.
I think [name_f]Freya[/name_f] [name_f]Ann[/name_f], [name_f]Freya[/name_f] [name_f]Catherine[/name_f] or [name_f]Freya[/name_f] [name_f]Louise[/name_f] would work really well!