All suggestions welcome rhankyou so much xx
[name_f]Louisa[/name_f]
[name_f]Beatrix[/name_f]
[name_f]Dorothea[/name_f]
[name_f]Rosamund[/name_f]
[name_f]Adeline[/name_f]
[name_u]Eloise[/name_u]
[name_f]Theodora[/name_f]
[name_f]Ottilie[/name_f]
[name_f]Susannah[/name_f]
[name_f]Harriet[/name_f]
[name_f]Helena[/name_f]
[name_f]Lucille[/name_f]
[name_f]Ophelia[/name_f]
[name_f]Penelope[/name_f]
[name_f]Sylvia[/name_f]
[name_f]Tallulah[/name_f]
[name_f]Vivienne[/name_f]
[name_f]Zinnia[/name_f]
[name_f]Eulalia[/name_f]
[name_f]Daphne[/name_f]
I think @bedhead hit the nail on the head. I’m seconding all of her suggestions. That being said, with [name_f]Florence[/name_f] and [name_f]Jemima[/name_f] my first thought was [name_f]Harriet[/name_f].
I also thought [name_f]Harriet[/name_f]. Also:
[name_f]Annabel[/name_f]
[name_f]Charlotte[/name_f]
[name_f]Emily[/name_f]
[name_f]Lucy[/name_f]
[name_u]Evelyn[/name_u]
[name_f]Henrietta[/name_f]
[name_f]Cornelia[/name_f]
[name_f]Cassandra[/name_f]
[name_f]Veronica[/name_f]
[name_f]Miranda[/name_f]
[name_f]Bethany[/name_f]
[name_u]Maxime[/name_u]
[name_f]Leona[/name_f]
I feel like [name_f]Florence[/name_f] and [name_f]Jemima[/name_f] are a very particular taste/style of vintage. Keeping that in mind, here are some names I thought might suit your sibset:
[name_f]Darla[/name_f]
[name_f]Dorothy[/name_f]
[name_f]Edith[/name_f]
[name_f]Georgia[/name_f]
[name_f]Marybeth[/name_f]
[name_f]Nanette[/name_f]
[name_f]Noreen[/name_f]
[name_f]Opal[/name_f]
[name_f]Regina[/name_f]
[name_f]Rosemary[/name_f]
[name_f]Sybil[/name_f]
[name_f]Sylvia[/name_f]
[name_f]Virginia[/name_f]
I’d go with [name_f]Imogene[/name_f] or [name_f]Bethany[/name_f]
[name_f]Lavinia[/name_f]
[name_f]Cordelia[/name_f]
[name_f]Sabina[/name_f]
[name_f]Aurelia[/name_f]
[name_f]Delilah[/name_f]
[name_f]Isadora[/name_f]
[name_f]Domenica[/name_f]
[name_f]Camilla[/name_f]
[name_f]Rowena[/name_f]
[name_f]Leona[/name_f]
[name_f]Adelaide[/name_f]
[name_f]Esme[/name_f]
[name_f]Cecily[/name_f]
[name_f]Olive[/name_f]
[name_f]Matilda[/name_f]
[name_f]Cressida[/name_f]
[name_f]Imogen[/name_f]
[name_f]Winifred[/name_f]
[name_f]Petra[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Phoebe[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Harriet[/name_f] (I second this one)
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Elsie[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Beatrice[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Louise[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Gertrude[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Katherine[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Elizabeth[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Pearl[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Esther[/name_f]
Sorry for any repeats–I only read the first couple replies, and then listed off all the names I could think of right there that go well stylistically with [name_f]Florence[/name_f] and [name_f]Jemima[/name_f]. [name_f]Hope[/name_f] it helps 
[name_u]Love[/name_u] both names, along with many of the suggestions. I second the suggestions of [name_f]Beatrix[/name_f]/[name_f]Beatrice[/name_f], [name_f]Louisa[/name_f], [name_f]Helena[/name_f], [name_f]Rosamund[/name_f], [name_f]Imogen[/name_f], [name_f]Dorothy[/name_f], [name_f]Edith[/name_f], [name_f]Harriet[/name_f], [name_f]Cecily[/name_f], [name_f]Olive[/name_f], [name_f]Matilda[/name_f] and [name_f]Esther[/name_f].
Other ideas:
[name_f]Tabitha[/name_f]
[name_f]Martha[/name_f]
[name_f]Dahlia[/name_f]
[name_f]Elspeth[/name_f]
[name_f]Alice[/name_f]
[name_f]Philippa[/name_f]/[name_f]Pippa[/name_f]
[name_f]Eliza[/name_f]
[name_u]Eloise[/name_u]
[name_f]Rosemary[/name_f]
[name_f]Gwendolen[/name_f]
[name_f]Camille[/name_f]
[name_f]Nancy[/name_f]
My first thought is [name_f]Rosalind[/name_f].
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Dorothea[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Winifred[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Margot[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f], and [name_f]Henrietta[/name_f]
In keeping with the British, vintage vibe…
[name_f]Alice[/name_f]
[name_f]Annabel[/name_f]/[name_f]Annabella[/name_f]
[name_f]Arabella[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Catalina[/name_f]
[name_f]Catherine[/name_f]
[name_f]Clara[/name_f]
[name_f]Della[/name_f]
[name_f]Diana[/name_f]
[name_f]Elizabeth[/name_f]/[name_f]Eliza[/name_f]
[name_f]Eulalie[/name_f]/[name_f]Eulalia[/name_f]
[name_f]Hazel[/name_f]
[name_f]Isadora[/name_f]
[name_f]Isla[/name_f]
[name_f]Iva[/name_f]
[name_f]Georgina[/name_f]/[name_f]Georgia[/name_f]/[name_f]Georgiana[/name_f]
[name_f]Lillian[/name_f]/[name_f]Lilliana[/name_f]
[name_f]Louisa[/name_f]
[name_f]Matilda[/name_f]/[name_f]Mathilda[/name_f]/[name_f]Mathilde[/name_f]
[name_f]Minerva[/name_f]
[name_f]Olivia[/name_f]
[name_f]Ottilie[/name_f]
[name_f]Priscilla[/name_f]
[name_f]Victoria[/name_f]
[name_f]Wilhelmina[/name_f]
[name_f]Winifred[/name_f]
[name_u]Love[/name_u] these names! I’ve got them both on my list, others I’m considering are:
[name_f]Sylvia[/name_f] or [name_f]Sylvie[/name_f]
[name_f]Cecily[/name_f] or [name_f]Cecilia[/name_f]
[name_f]Tabitha[/name_f]
[name_f]Martha[/name_f]
[name_f]Marjorie[/name_f]
Sussannah
[name_f]Lavinia[/name_f]
[name_f]Beatrix[/name_f]
Personally [name_f]Cecily[/name_f] is my favourite. [name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Cecily[/name_f]. [name_m]How[/name_m] perfect!
I love the suggestions of [name_f]Eulalia[/name_f] and [name_f]Esther[/name_f]!
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Muriel[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Mabel[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Amabel[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Maude[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Marguerite[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Bernadette[/name_f] ([name_f]Birdie[/name_f])
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Roxanne[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Maxine[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Pearl[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Ruth[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Verena[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Priscilla[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Araminta[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Iolanthe[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Clarinda[/name_f]
[name_f]Florence[/name_f], [name_f]Jemima[/name_f] and [name_f]Lisbeth[/name_f]
[name_f]Florence[/name_f] and [name_f]Jemima[/name_f] are a beautiful sibset! As others have said, they give off a vintage, British vibe. They feel feminine but strong and solid to me. Here are some suggestions/seconding:
[name_f]Beatrix[/name_f]
[name_f]Josephine[/name_f]
[name_f]Catherine[/name_f]
[name_f]Kathleen[/name_f]
[name_f]Hazel[/name_f]
[name_f]Ivy[/name_f]
[name_f]Amelia[/name_f]
[name_f]Helena[/name_f]
[name_f]Margaret[/name_f]
[name_f]Margot[/name_f]
[name_f]Agnes[/name_f]
[name_f]Philippa[/name_f]
[name_f]Elspeth[/name_f]
[name_f]Rosalie[/name_f]
[name_f]Tamsin[/name_f]
[name_f]Susannah[/name_f]
[name_f]Winifred[/name_f]
[name_f]Victoria[/name_f]
[name_f]Mabel[/name_f]
[name_f]Augusta[/name_f]
[name_f]Alice[/name_f]
[name_f]Rebecca[/name_f]
[name_f]Lucy[/name_f]
[name_f]Daisy[/name_f]