I'm a little confused, as you seem to have a few on your list (Grace, Alice, Mila, Vivienne, Morgan) that don't seem to have the same "rare" feel as Saffron and Adelais.
That said though, how about:
From your list, I see this as suiting what you want, a unique name:
Nice names, but definitely not unique:
Personally I dislike Grace. It's also very common, so I'd be surprised to see it in a sibset with Saffron or Adelais.
None of those names are as rare as Saffron and Adelais.
Ophelia, Allegra, Saskia, Suki and Avalon are uncommon and one of those would fit the bill. Grace, Alice, Mila, Millie, Vivienne, Sasha and Morgan are all too normal. Clover is pretty uncommon, but I don't like Clover and Saffron in the same sibset.
Names that seem to go with Saffron and Adelais would be rare British names, Something exotic and eccentric.
Ophelia would be lovely with other sister names :-)
From your list I really like Allegra and Morgan. And I for one, think Grace is great!
Some suggestions for you - Carden, Thalia, Isabeau, Clemency, Keela/Keely, Bronte, Etta, Bay, Iris, Farren, Celia, Maren, Bettina, Sybilla, Eleanora, Margot, Jemima, Lilac, Amity, Cornelia, Delphine, Eloisa, Eulalia, Nella, Rosaline, Adair, Thora, Verity, Xanthe, Marlowe, Kirrily and Zillah.
Have fun on your naming journey!
Saffron is a GP name of mine. So glad to see it used! To fit with your girls, I'd go for a very unique name...
Kimia (A Persian name)
Annecy (a lake name)
Baran (Persian... rain)
Raha (Persian... freedom)
Mahasti (Persian... cool name... "moon's being")
Yes I agree about the grace, Alice, Mila comments. They have always been on our list but too common to use for a first name but might get up for the middle name as we have
Saffron Eva and
I think Saskia is our front runner but worry it is too similar in sound to Saffron and the Saff/Sass nickname.
Also holding back on Suki as hubby had a cat named this as a child. But it is very cute!
Thanks for your suggestions especially interested in Aviva, eliska, vesper (love this but have already run it past hubby to a resounding no)
I really like the idea of a V name like vivienne. What do you think about Viveca? Or any other V suggestions??
I am sure the perfect name is out there and I still have 6 months to sweat on it!