I really like Morgana. Morgan is nice, but I don't like Morrigan. I would never name a child Eternity, Whisper, Morticia, Moonlight, or Belladonna. Lillith is alright. But what about Ebony?

i think belladonna marie is pretty

Morgana Marie is pretty (or Morganna is a nice spelling, too)

lillith

lillith marie is a beautiful name. its not over the top but its still different. congrats on your soon to be healthy baby.

Naming your baby in the realm of your own chosen subculture is self-indulgent. It's as if you're choosing who you want your child to be. Let her become the person she is going to be. You want to have your own style, and be your own person. Your child wants the same.

Saying that... the most "Gothic" thing you could do is to drop the "Halloween", and go for a Medieval name from the Gothic period in History (1200-1500+), or names that were popular during the Gothic architecture period in Western Europe. Another idea would be to go for an Old English name.

Some examples of Medieval period names:

Ainsley
Adaleide
Adelina
Agatha (my Gothic choice, if I had to pick)
Amira
Annora
Beatrice
Celestria
Edith
Eleanora
Gracia
Isabel
Leticia
Lyneya
Malina
Matilda
Rayne
Sabina
Thora