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 😊

Elisabeth - Lissie
Katharine - Kate
Penelope - Penny
Alexandra - Sasha
Isabella - Bella

@Tryagain2020 sorry no idea what Sadler's Wells is.

Henrietta nn Etta
Alexandra nn Sasha
Congratulations on your new baby 💐

Alexandra is a lovely name, I've seen it shortened mostly to Ally, but also Lexi, Lexa, Andi, Sandy, Alex and Xan

We have an Isabella and we love it.
Others I loved that might work were Penelope, Dorothy and Eloise.

There's a series of books about a ballet dancer called Veronica who marries Sebastian. They're the main characters.

isadora (nn Izzy or Dora)
iliana (nn Lana)
anastasia (nn Ana, Tass)

Penelope

Vanessa

Penelope
aurelia
anastasia
calliope
henrietta
arabella
isabella
theodora
victoria
elizabeth
alexandra
mariana
gabriella
cecilia
emilia
amrlia
olivia

Cassandra - Cassie
Theodora - Thea / Dora / Dory
Ophelia - Effie

Sebastian (Seb) and

I was going to suggest Alexandra but saw you don't like Alex.
Abigail (Abbie)
Florence Florrie Reni Flora
Harriet Hattie
Elizabeth Lizzie Libby Ellie Eliza Bibby Beth Betsy Bessie
Georgia Gee. Gia. Georgie.
Aurora Rori
Beatrix. Beattie Trixie.

Felicity?

Seb & Fliss sound lovely together

Theodora (Dora)
Abigail (Abby)
Penelope (Pen/Penny)
Francesca (Fran/Chess)
Aurora (Rory)
Vivienne (Vivi)
Tatiana (Tati)

I like Isabella too. Seb and Izzy. Or bella and seb 🙂

Mariella (Mari, Ella)
Ophelia (Fifi, Phe)
Otillia (Ottie, Tillie)
Henrietta (Hettie, Etta)
Carolina (Carrie)
Seraphina (Seph)
Elisabetta (Lizzie, Ellie, Betty, Betsy, Libby)
Antigone (Tiggy)
Cordelia (Delia)

I wanted to use Pollyanna, shortened to Polly but DH said no. I still adore it though.

Juliana, Liliana (Lia / Ana)
Polyanna

Allegra

I like Andie as a nickname for Alexandra type names.

Felicity nn Lissy
Catalina nn Cat
Josephine nn Josie
Dolores nn Dolly
Jessamine nn Jess
Raphaella nn Raff
Romilly nn Romy
Aurora nn Rory
Seraphina nn Sera/Finn

Thanks for the great suggestions, will chat over with the husband and hopefully come to a decision!

Alicia - Lissy

Adriana (add-re-ahna), NN Addie

Katerina. Kat
Cassandra. Cass
Elizabeth. Beth
Yolanda. Yo

Emilia - nn Emmy or Millie

Araminta nn Minty
Angelica