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I think the way you intend to pronounce the name yourselves is the way to spell it.
If you intend to say Vee-o-lette, spell it Violette, if you intend to say Vi-let, spell it Violet.
French...

Rosemary came to mind - has nn Romy/ Rosie/ Mary and a real classic choice

Ellie Clementine - sounds great, however maybe a bit too matchy with big sister Izzie Caroline
Amelia Mae - I agree that it's M heavy with an M last name, although on its own it sounds lovely
Ellie...

First of all I really like Caroline Michelle.
Lela as nn could be too far fetched. Carolina Michelle (nn Lina/Le(e)la might be easier).
Maybe a second middle name could be the solution to your...

Iris Juliet Eve
Iris Juliet Pearl
Iris Juliet Frances

Love Amelia and Evelyn, but I think those are a bit too long behind Iris Juliet.

Or maybe stick to floral but with similar sound: Rosalie

Yolanda is a 70's name to me, nothing wrong with it, but if you are worried about it, why not suggest Violet (same meaning) ?

1st place Anna Josephine and close 2nd place Anna Caroline i.m.o.

Love Marisol/Helena/Lucia/Eloise
Here are some other ones:
Eliana
Kira
Orlanda

Many lovely choices.
I like Anna Caroline best with Susanna Joy a close second.
Caroline Joy would be a twist to consider in case you decide against the S initial.

How about:
Pearl
Marguerite / Margot
Marisol
Rosemary "dew of the sea"
Coraline
Ziva

Imogen and Hazel I like best. Finally chose Imogen. Sounds lovely with the siblings.
Maybe Imogen Hazel would be perfect. Love the nature connections: Iris (flower/blue) and Jasper (stone/green),...

I was thinking of Evelyn Daisy too :)
Lucy Annabel (this spelling) I adore equally.
Difficult choice.

forgot Coralie
and Daphne :)

Something old / something new...
Julie
Naomi
Nikki / Nicky
Evy
Valerie
Ivy
Marie
Hattie
Leonie

Go for it! Oscar is a lovely name and the nickname certainly works. I know an Oscar also called Ossi and co-workers used to call him Ozz as in the "Wizard of..." whenever he thought of some clever...

It would help to know if this girl will be living in Holland at some point in her life.

Beatrix sounds lovely with Holly in English, but as it is the current Queen is called Beatrix (75 years of...

How about Ivy Helena Cook instead of Havana?
(Havana just says cigar to me but the sounds together are great)

Instead of Pearl options:
P sounds:
Ivy Paola Cook
Ivy Penelope Cook

or
Ivy...

French e = ay lo DEE - stress on last syl.

Simona
Colette
Nicole
Margo(t)
Eloise
Clio
Clover
Fiona
Leona
Hermione

From your options I like Graham best, but would pair it with James. GrahaM Mayer is too MM close for my liking.

Elliott is totally boy for me by the way. Graham Elliott in fact would be super. :)...

Eliza - Elaine / Elsa / Eliana
Tessa - Thirza
Juliet - Justine / Harriet / Jeanette
Genevieve - Giselle / Gemma / Gillian / Georgina
Clara - Carla/ Tara / Ciara / Cora
Charlotte - Caroline (do...

Just call her Helena/ Elena/ Elaine and shorten it to the nick name you want.

Daphne anyone?

Caroline Paige :) Best flow and I agree that from your option this fits best with big sister's name Allison Jane.