[name_f]Violet[/name_f].
I like it best style-wise with [name_f]Georgia[/name_f] and Eloise……plus I love how all the names have the letter O. It is actually the third letter of each name. It might seem like a subtle thing, but it create a strong link between the names.
The other girls have a nod to the family in their middle names. [name_f]Lucy[/name_f] (for my husband who’s middle name is Luke) and [name_u]Anne[/name_u] (mine and my moms middle). [name_f]Clara[/name_f] is my grandmothers middle name, so not a “direct” honor per say and she passed before any of my children were born but was the only grandparent I was close with.
[name_m]Ah[/name_m], that makes sense! I’d say [name_f]Clara[/name_f] is a wonderful choice then 
Another reason I like [name_f]Violet[/name_f] is because it has a different ending than Georgi@ and EloiSe. [name_f]Willa[/name_f] and [name_f]Clara[/name_f] repeat the A ending of [name_f]Georgia[/name_f]. Also, it is about the same length as the other sisters’ names.
For a middle name I’d like….
Georgi@ LucY
Eloi$e [name_f]Ann[/name_f]
Viol3t Clare* (or Clara)
*I prefer [name_u]Clare[/name_u] over [name_f]Clara[/name_f] because it gives all the girls a total of four syllable counts in their first and middle names combined. Though you could use [name_f]Clara[/name_f], as Vi-o-let is sometimes said as two syllables, [name_f]Vi[/name_f]- let [name_u]Clair[/name_u]- ah
I love [name_f]Violet[/name_f] for the same reason! And the fact that o is the 3rd letter in each is such a fun little tie. I do slightly prefer [name_f]Violet[/name_f] [name_u]Clare[/name_u], but we have another [name_u]Clare[/name_u] in the family, so it would sound like a nod to her instead of my grandmother who we are trying to honor.
Like I said, [name_f]Violet[/name_f] is usually said as a two syllable name so Viol3t [name_f]Clara[/name_f] works.
[name_f]Do[/name_f] you understand what I mean about how nice and balanced it sounds when all the names have the same total syllable count?
I think it is nice that each girl would have a middle name that honors someone in the family.
I think I like [name_f]Violet[/name_f] best with your other kids.
Yes! I really love it with our girls names just wish it wasn’t so popular 
About the popularity, I personally don’t know and haven’t heard of any girls named [name_f]Violet[/name_f]. I am located in the Eastern US.
[name_f]Georgia[/name_f], [name_f]Eloise[/name_f] and [name_f]Clara[/name_f] sound best to me. I’ve never been a fan of [name_f]Willa[/name_f], but [name_f]Violet[/name_f] is nice, but I still think [name_f]Clara[/name_f] sounds the best with your other two.