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I think all these names go together well. [name_f]Lilla[/name_f] and [name_f]Vivienne[/name_f] are more common and popular sounding than some of your other choices like [name_m]Oscar[/name_m] or [name_m]Rupert[/name_m], but they are all old fashioned sounding and I think any would go well with them. I quite like [name_m]Rufus[/name_m], but it’s a little out there for me to use. I think you have a great set of choices! As long as you feel that you love some of these I don’t see that you would need to add any more.
[name_f]My[/name_f] favorites:
[name_f]Lilla[/name_f], [name_f]Vivienne[/name_f] and [name_f]Isobel[/name_f]
[name_f]Lilla[/name_f], [name_f]Vivienne[/name_f] and [name_m]Jasper[/name_m]
I like [name_f]Eleanor[/name_f] best for girl name, and [name_m]Graham[/name_m] for boy! 
I always have admired your sibset, [name_f]Lilla[/name_f] and [name_f]Vivienne[/name_f] are so sweet and beautiful! The names on your list just seem to fit right in, I can totally see [name_f]Cecily[/name_f] with [name_f]Lilla[/name_f] and [name_f]Vivienne[/name_f], although I have to admit my personal favourite would be [name_f]Iris[/name_f]. Again, [name_m]Rufus[/name_m] and [name_m]Jasper[/name_m], wonderful! I do absolutely love the name [name_m]Rufus[/name_m]… Also [name_f]Lilla[/name_f], [name_f]Vivienne[/name_f] and [name_u]Elliott[/name_u] make a sibset I’d love to see.
Cohesive, definitely. You have lovely names going on there!
I love [name_f]Cecily[/name_f], [name_f]Eleanor[/name_f], and [name_f]Isobel[/name_f] with [name_f]Lilla[/name_f] and [name_f]Vivienne[/name_f].
For boys, my favorites with the girls’ names are [name_m]Jasper[/name_m] and [name_m]Oscar[/name_m].
All lovely, best of luck!
Thank you so much!
I think [name_f]Isobel[/name_f] is amazing with your sibset. Like [name_f]Lilla[/name_f] and [name_f]Vivienne[/name_f], [name_f]Isobel[/name_f] is sort of a twist on a popular name. It also has an “ih” sound in the first syllable like the others, and is very pretty and feminine.
I like [name_f]Isabel[/name_f] and [name_m]Oscar[/name_m] with your set.