Already thinking #2

So we were team green for our first and we'll reuse our boy name for the next one (we actually have two alternative choices for boys besides) But now I'm speculating on girl names in case #2 is also a girl. We aren't going to TTC until DD is at least 18mo BTW

DD is Oona Persephone

We are considering  Brigid/Brigit as our first name choice. I also like Tatiana (nn Tatia) as another first name consideration but haven't had a chance to run it by DH before posting. I wrote this post to pick your brains on MN suggestions as he dubs it too soon to discuss (tho he did admit to liking Brigit/Brigid) and I am drawing blank.

 DH likes Celtic or Latin names with lots of vowel sounds.

Here is my girls name short list for perspective on my naming style:

Myrna

Marlene (nn Leana, Marla)

Xira

Estelle (nn Stella)

Willamina (nn Willa, Billy, Mina, Minnie)

Isadora (nn Dory, Sadie, Dora)

Penelope (nn Poppy, Penny, Pippa, Nell)

Belladonna (mn Only)

Charlemagne (one of my few cross-gender favorites, first name only, nn Charly)

Arianrhod  (mn only)

Arachne (mn only)

Artemis/Artemia

Ceridwen

Hesperia/Hestia

Theda

Ariadne

Eowyn

Astrid

Millicent (nn Millie)

Minerva  (nn Minnie)

Roosevelt (mn only)

Roxanna (nn Roxy, Rocky)

Theodora (nn Theo, Dory, Dora)

Ursula

Vladamira (nn Vlora)

Zelda

Rose

I realize that my naming style is not for the faint of heart. If you hate my names then I will probably hate your suggestion. But if you think you can help, I'd love to hear it.

So... middle name suggestions for Brigit/Brigid and/or Tatiana?