Sebastian's sister is called...

[BibliophileYogiGirl]

Thoughts?

Veronica

Francesca

Celeste
Calisa
Harriet
Isabel
Kiera
Thomasina

Has anyone suggested OP calls the sister Sebastian?
It’s just to give an idea of the names they like and have already used. It means that people won’t suggest names that might clash or sound too similar.
Surely there are millions of other threads you can go on to chastise the OP. Asking for name suggestions isn’t really the place.

I really like Genevieve, Josephine, Beatrice and Beatrix to go with Sebastian.

Hazel

OP didn't expressly say she wanted the names to "go together" but even if she did I don't see a contradiction in wanting your siblings' names to go together and treating them as individuals. Most people who ask are just looking for ones in a similar style not rhyming or samely.

Also, one thing that's important in parenting is surely to treat your children equally. If you call one sibling some fancy three or four-syllable name while the other sibling has some plain one-syllable name that might cause resentment.

Ariel

Juliet
penelope
josephine
erica

The Sebastian’s that I know have sisters called Sienna, Tallulah and Cordelia.

Eloise

Juliet
Violet
Victoria
Daisy
Matilda
Emma

Julia (if you are an Evelyn Waugh fan)

It's a popular name in a lot of Catholic countries so it goes with a lot of Saint / Biblically inspired names: Theresa, Gabriella etc.

Also Shakespearean, as others have mentioned so other Shakespearean names would tie in well. Juliet, Imogen and Viola have been mentioned already but also Miranda, Rosalind, Olivia etc etc....

Anna
Jane
Margot

Julia.