Names DH & I like but can’t use: Isabelle/a, Grace, Charlotte, Clara, Chloe, Elena, Mia, Maeve, Sienna
Names we dislike: Rose, Sophie/a, Amelia/Amy/Millie, and anything too “out there” (Aurora, Seraphina, Otillie, etc).
We both love Ella but it’s too close to Isla 
Thank you! 
I like [name_f]Emily[/name_f], as I’ve said above.
Also:
Catherine/Caitlin/Catriona/Katharine
[name_f]Dilys[/name_f]
[name_f]Elspeth[/name_f] (I think this fits well with Isla)/Elizabeth
[name_f]Enid[/name_f]
[name_f]Flora[/name_f] (again with the Scots theme)
[name_f]Helen[/name_f] (if you don’t mind repeating the H)
[name_f]Jane[/name_f], [name_f]Jean[/name_f], or [name_f]Joan[/name_f] (all three are perfect, not too matchy with [name_m]Jack[/name_m], and [name_f]Jean[/name_f] and [name_f]Jane[/name_f] fit well with Isla)
[name_f]Lucy[/name_f]
[name_f]Mary[/name_f] (I know it’s super traditional but [name_f]May[/name_f] is such a sweet nn)
[name_f]Margaret[/name_f]
[name_f]Maud[/name_f]
[name_f]Tamsin[/name_f] (It’s a bit out there, but fits well with your other names)
[name_f]Vera[/name_f] (matches your Edwardian sibset)
[name_m]Harry[/name_m], [name_m]Jack[/name_m], and [name_f]Isla[/name_f] go so well together!
Maybe you would like…
[name_f]Willa[/name_f] / [name_f]Willow[/name_f]
[name_f]Ruby[/name_f]
[name_f]Emma[/name_f]
[name_f]Etta[/name_f]
[name_f]Eve[/name_f] / [name_f]Eva[/name_f] / [name_f]Evie[/name_f]
[name_f]Faith[/name_f]
[name_f]Tess[/name_f] / [name_f]Tessa[/name_f]
[name_f]Thea[/name_f]
[name_f]Lucy[/name_f] / [name_f]Lucia[/name_f]
[name_f]Olivia[/name_f]
[name_f]Alice[/name_f]
[name_f]Penny[/name_f]
[name_f]Ada[/name_f]
[name_f]Caroline[/name_f]
[name_f]Frances[/name_f]
[name_f]Georgia[/name_f]
[name_f]Maisie[/name_f]
[name_f]Kate[/name_f] / [name_f]Cate[/name_f] / [name_f]Katie[/name_f]
[name_f]Zoe[/name_f]
[name_f]Vivian[/name_f]
[name_f]Nina[/name_f]
[name_f]Celia[/name_f]
[name_f]Lydia[/name_f]
[name_f]Opal[/name_f]
[name_f]Pearl[/name_f]
[name_f]Cora[/name_f]
[name_f]Nora[/name_f]
[name_f]Sadie[/name_f]
[name_f]Molly[/name_f]
[name_f]Phoebe[/name_f]
[name_f]Adelaide[/name_f] fits nicely with siblings names. I also have:
[name_f]Alice[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Aria[/name_f]
[name_f]Nora[/name_f]
[name_f]Riley[/name_f]
[name_f]Addison[/name_f]
[name_f]Claire[/name_f] (Very similar to [name_f]Clara[/name_f], but still a cute name that fits with siblings)
[name_f]Quinn[/name_f]
[name_f]Ada[/name_f]
[name_f]Edith[/name_f]
[name_f]Evelyn[/name_f]
[name_f]Kathryn[/name_f]
[name_f]Elspeth[/name_f]
[name_f]Gwen[/name_f]
[name_f]Elsa[/name_f]
[name_f]Jean[/name_f]
(Some of these are a little out there, but they all fit well with your other kiddos names) [name_f]Hope[/name_f] these helped!
Maybe…
[name_f]Eve[/name_f]
[name_f]Nora[/name_f]
[name_f]Sasha[/name_f]
[name_f]Eloise[/name_f]
[name_f]Laurel[/name_f]
[name_f]Dawn[/name_f]
[name_f]Zoe[/name_f]
[name_f]Allison[/name_f] nn [name_f]Allie[/name_f]
[name_f]Trista[/name_f]
Hopefully these help 
Your kids have wonderful names!
[name_f]Alice[/name_f]
[name_f]Bette[/name_f]
[name_f]Bettie[/name_f]
[name_f]Carlie[/name_f]
[name_f]Claire[/name_f]
[name_f]Danielle[/name_f]
[name_f]Elaine[/name_f]
[name_f]Emme[/name_f]
[name_f]Genevieve[/name_f]
[name_f]Hallie[/name_f]
[name_f]Madeline[/name_f]
[name_f]Mae[/name_f]
[name_f]Mariam[/name_f]
[name_f]Paige[/name_f]
[name_f]Penelope[/name_f]
[name_f]Roxanne[/name_f]
[name_f]Shannon[/name_f]
[name_f]Blair[/name_f]
How about [name_f]Emma[/name_f], opposed to [name_f]Ella[/name_f]? I love [name_f]Emma[/name_f] as a younger sister to [name_m]Harry[/name_m], [name_m]Jack[/name_m], and [name_f]Isla[/name_f].
[name_f]Alice[/name_f], [name_f]Erin[/name_f], [name_f]Claire[/name_f], [name_f]Lily[/name_f], Lucy/Lucie, [name_f]Olivia[/name_f], [name_f]Daisy[/name_f], and [name_f]Leah[/name_f].
i think either olive or nell would be perfect sisters to harry, jack, and isla! 
[name_m]Harry[/name_m], [name_m]Jack[/name_m], [name_f]Isla[/name_f] and…
[name_f]Alice[/name_f]
[name_f]Phoebe[/name_f]
[name_f]Freya[/name_f]
[name_f]Elsie[/name_f]
[name_f]Eve[/name_f]
[name_f]Zoe[/name_f]
[name_f]Willow[/name_f]
[name_f]Lucy[/name_f]
[name_f]Kate[/name_f]
[name_f]Pippa[/name_f]
What about [name_f]Evie[/name_f], [name_f]Zoe[/name_f], or [name_f]Millie[/name_f]?
[name_m]Harry[/name_m], [name_m]Jack[/name_m], [name_f]Isla[/name_f], and…
[name_f]Cleo[/name_f]
[name_f]Zelda[/name_f]
[name_f]Lily[/name_f]
[name_f]Vera[/name_f]
[name_f]Effie[/name_f]
[name_f]Elsie[/name_f]
[name_f]Edie[/name_f]
[name_f]Eliza[/name_f]
[name_f]Edith[/name_f]
[name_f]Adele[/name_f]
[name_f]Willa[/name_f]
[name_f]Mina[/name_f]
[name_f]Josie[/name_f]
[name_f]Cecelia[/name_f]
[name_f]Daphne[/name_f]
[name_f]Phoebe[/name_f]
[name_f]Fiona[/name_f]
[name_f]Flora[/name_f]
[name_f]Lucy[/name_f]
[name_f]Luna[/name_f]
[name_f]Poppy[/name_f]
[name_f]Ruby[/name_f]
[name_f]Thea[/name_f]
[name_f]Alice[/name_f]
[name_f]Lydia[/name_f]
[name_f]Celia[/name_f]
[name_f]Gwen[/name_f]
[name_f]Elsa[/name_f]
[name_f]Blair[/name_f]
[name_f]Daisy[/name_f]
[name_f]Pippa[/name_f]
[name_f]Nora[/name_f]
I like H@rry, J@ck, Isl@ and…
[name_f]Phoebe[/name_f]
[name_f]Thea[/name_f]
[name_f]Tess[/name_f]
[name_f]Nell[/name_f]
[name_f]Lydie[/name_f]
[name_f]Daphne[/name_f]
[name_f]Chloe[/name_f]
[name_f]Audrey[/name_f]
[name_f]Allegra[/name_f]
[name_f]Eden[/name_f]
[name_f]Esme[/name_f]
[name_f]Rachel[/name_f]
[name_f]Sybil[/name_f]
How about
[name_f]Eileen[/name_f]
[name_f]Claire[/name_f]
[name_f]Clare[/name_f]
[name_f]Elise[/name_f]
[name_f]Joan[/name_f]
[name_f]Rose[/name_f]
[name_f]Maisie[/name_f]
[name_f]Megan[/name_f]
Wow, thanks everyone! Wasn’t expecting so much of a response. I’ll go through your replies asap xx
Harry, Jack, Isla &
Eve (nn Evie) - I like that there would then be 2 x 2 syllable names and 2 x 1 syllable names 
Emily
Phoebe
Bronte
Peggy
Frances
Willow
Lucy
Annie
Zoe
Mary nn Polly
Romy
Margot
Felicity
Daphne
Celeste
Adelaide (“Daisy”)
Daisy
Marianne
Marion
[name_f]Norah[/name_f] immediately came to mind!
[name_m]Harry[/name_m], [name_m]Jack[/name_m], [name_f]Isla[/name_f] &
[name_f]Ada[/name_f] / [name_m]Adda[/name_m]
[name_f]Alena[/name_f]
[name_f]Alice[/name_f]
[name_f]April[/name_f]
[name_f]Aria[/name_f]
[name_f]Aspen[/name_f]
[name_f]Ava[/name_f]
[name_f]Bella[/name_f]
[name_f]Blair[/name_f]
[name_f]Blythe[/name_f]
[name_f]Calla[/name_f]
[name_f]Capri[/name_f]
[name_f]Cara[/name_f]
Ciella
[name_f]Cleo[/name_f]
[name_f]Daisy[/name_f]
[name_f]Delia[/name_f]
[name_f]Della[/name_f]
[name_f]Eleni[/name_f]
[name_f]Elise[/name_f]
[name_f]Emma[/name_f]
[name_f]Faye[/name_f]
[name_f]Fiona[/name_f]
[name_f]Lara[/name_f]
[name_f]Lena[/name_f]
[name_f]Leona[/name_f]
[name_f]Leonie[/name_f]
[name_f]Lina[/name_f]
[name_f]Lottie[/name_f]
[name_f]Maud[/name_f] / [name_f]Maude[/name_f]
[name_f]Mila[/name_f]
[name_f]Mona[/name_f]
[name_f]Naomi[/name_f]
[name_f]Nina[/name_f]
[name_f]Nola[/name_f]
[name_f]Nomi[/name_f]
[name_f]Nora[/name_f] / [name_f]Norah[/name_f]
[name_f]Oona[/name_f]
[name_f]Penny[/name_f]
[name_f]Pia[/name_f]
[name_f]Sierra[/name_f]
[name_f]Stella[/name_f]
[name_f]Thea[/name_f]
[name_f]Vienna[/name_f]
[name_f]Willa[/name_f]
[name_f]Anna[/name_f]
[name_f]Caroline[/name_f]
[name_f]Charlotte[/name_f]
[name_f]Clara[/name_f]
[name_f]Eleanor[/name_f]
[name_f]Eliza[/name_f]
[name_f]Elizabeth[/name_f]
[name_f]Emily[/name_f]
[name_f]Emma[/name_f]
[name_f]Hannah[/name_f]
[name_f]Isabella[/name_f]
[name_f]Jane[/name_f]
[name_f]Julia[/name_f]
[name_f]Lucy[/name_f]
[name_f]Lydia[/name_f]
[name_f]Margaret[/name_f]
[name_f]Penelope[/name_f]
[name_f]Rose[/name_f]
[name_f]Sophia[/name_f]
Still working through the names 
One that I noticed immediately was [name_f]Caroline[/name_f]. I do love that name, and there’s lots of nickname ideas 
And as I said in my OP, DH and I love [name_f]Charlotte[/name_f] & [name_f]Clara[/name_f] but they can’t be used - this could be a nice alternative!