I like [name]Catherine[/name] “[name]Kate[/name]” or [name]Vivienne[/name] “[name]Viv[/name]” (although I would love to see [name]Vivi[/name]!) best with [name]Gabrielle[/name] “[name]Gabby[/name]”. I love the nn [name]Bea[/name], but I think [name]Gabby[/name] and [name]Bea[/name] are too close, unfortunately. I prefer [name]Catherine[/name] in general, but I like [name]Gabrielle[/name] and [name]Vivienne[/name] better as sisters.
[name]Juliette[/name] or [name]Vivienne[/name] would be lovely for [name]Gabrielle[/name]'s sister. I like the fact that the three names would share double letters.
I voted for [name]Juliette[/name], but [name]Vivienne[/name] and [name]Catherine[/name] would also be great. [name]Gabby[/name] and [name]Jules[/name] is just so cute, though.