Twin sister to Elizabeth

I think Maria, or Abigail

Rebecca.

Eleanor
Grace
Annie
Sophia
Rebecca

Victoria, because I think nicknames tori and Beth sound lovely.

Elizabeth and Samuel are gorgeous classic names. Trying to think of others that would match them is hard!!:

Imogen
Edith (Edie)
Margaret (Maggie)
Clementine (clemmie)
Cora (maybe a bit trendy?)
Delilah
Ottilie (Ottie)
Roxanne/Roxanna

Martha
Charlotte
Emily

Victoria
Penelope
Catherine
Alice

Marianne

Annie or Ida

Martha
Annabel
Cassandra
Rose
Violet

Hannah

Without giving too much away there is an Elizabeth and Samuel in my very close family so I'm going to give you Alexandra

Jessica

Margaret
C/Katherine

(All long traditional names with a choice of short forms)

Nora

Florence
Katherine

Gorgeous names

Jessica <preteen years spent with nose in a Sweet Valley Twins book>

Victoria is a lovely name but it's a bit too 'royal' (or indeed regal) with Elizabeth.

Mariella
Madeleine
Louisa
Alethea
Cecilia
Leonora

Ooh, I think Florence and Alexandra work really well.

Seraphina?

Katherine
Jennifer
Grace
Rose
Jessica
Tamsin

Here are some names I think would go nicely with the other two 😊

Josephine
Lydia
Beatrice
Emma
Victoria
Jane
Violet
Emily
Lucy
Freya
Sophie
Florence
Beatrix
Alice
Bethany
Ellen
Louise
Esme

Charlotte instantly sprang to my mind

Victoria
Catherine/Katharine
Alexandra
Antonia
Georgina

Diana

Charlotte
Rosalind
Jessica