Help naming baby girl

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We're looking for a girls name, preferably 4 syllables, that shortens nicely to a nn, to match her brother, Sebastian (Seb). Open to ideas as we are stuck in a rut and baby is 2 weeks old! Middle name will be May. Thanks in advance 😊

Rosaria / Rosario
Leonora / Eleanora
Annalisa
Dorothea nn Dorey as well as Dora
Theodora
Isadora
Clementina
Carolina
Catarina
Annabella / Arabella
Hermione
Marianna
Benedicta
Eloisa
Domenica
Alicia
Victoria / Vittoria
Davinia
Abigail
Evangeline
Octavia
Cornelia
Antonia

Rhiannon May
Olivia May
Elizabeth May
Penelope May
Genevieve May
Catriona May
Felicity May
Bethany May
Caterina May
Hermoine May
Lorelei May
Isabella May
Calliope May

Sebastian and Octavia (I love the nickname "O")

Other ideas -

Seraphina
Natalia
Anastasia
Carolina
Celestina
Felicity
Elizabeth
Angelina
Demetria nn Demi
Wilhelmina nn Billie, Mina
Katarina
Juliana
Alexandra
Amalia

3 syllables -
Annika
Davina
Malia
Elena
Serena
Sophia
Madeline
Sienna
Josephine
Vienna
Aurora
Cassidy
Annabelle
Juliette
Genevieve
Anna-Marie

I love the name Clementine, shortened to Clemmie.
Also Anastasia
Vanessa
Felicity
Katharine
Gillian
Julia
Verity
Sabrina
Helena
Tabitha

Margaret nn Maggie.
Victoria nn Tory
Arabella nn Bella

I personally think Maggie and Seb sounds canny.

Anastasia

Karenza
Rowena
Rebecca
Eloise/a
Georgiana

hope you will tell us what you choose!