Looking for names that gives you the imagery of something majestic but also has a dark feeling to it.
Some names I have so far:
[name_u]Raven[/name_u], [name_f]Tabitha[/name_f], [name_u]Vesper[/name_u], [name_f]Eris[/name_f], [name_f]Zelda[/name_f], [name_f]Aria[/name_f], [name_f]Judith[/name_f], [name_f]Maeve[/name_f].
[name_f]TIA[/name_f] 
Some names I can think of are [name_f]Adriana[/name_f], [name_f]Leila[/name_f], [name_f]Isabelle[/name_f], [name_f]Ivy[/name_f], [name_f]Amara[/name_f], and [name_f]Maura[/name_f].
[name_f]Leila[/name_f], [name_u]Vega[/name_u], [name_f]Nix[/name_f], Asterope, Chrysothemis, [name_f]Nisha[/name_f], [name_f]Kali[/name_f], [name_m]Altair[/name_m] (I know it’s a commonly masculine name but I love when it’s genderbent)
[name_u]Adair[/name_u], [name_f]Lenore[/name_f], [name_f]Amabel[/name_f], [name_f]Cressida[/name_f], [name_f]Rowena[/name_f]
When I read the thread title, I immediately thought [name_f]Nyx[/name_f], who’s name literally means ‘night’, and who was the [name_f]Goddess[/name_f] of the [name_m]Night[/name_m]. Some others I like from previous suggestions are [name_u]Adair[/name_u], [name_f]Amabel[/name_f], [name_f]Nisha[/name_f], [name_f]Kali[/name_f] and [name_f]Maura[/name_f].
[name_f]Rowena[/name_f]
[name_f]Leila[/name_f]
[name_f]Luna[/name_f]
[name_u]Sage[/name_u]
[name_f]Violet[/name_f]
[name_f]Scarlett[/name_f]
[name_f]Mavis[/name_f]
[name_f]Lilith[/name_f]
[name_f]Naomi[/name_f]
[name_f]Vanessa[/name_f]
[name_f]Ivy[/name_f]
[name_f]Lucretia[/name_f]
[name_f]Tamara[/name_f]
[name_f]Rosamund[/name_f]
[name_f]Morgana[/name_f]
[name_f]Guinevere[/name_f]
[name_f]Lilith[/name_f]
[name_u]Love[/name_u] the suggestion of [name_f]Luna[/name_f]! [name_f]Tabitha[/name_f] is great also.
Hecate, [name_f]Lilith[/name_f], [name_f]Aster[/name_f]/[name_f]Asteria[/name_f], [name_f]Apollonia[/name_f]
(wow, this ended up much longer than I intended. Sorry!)
[name_f]Antinea[/name_f]
[name_f]Ambrosia[/name_f]
[name_f]Azenor[/name_f]
[name_f]Elspeth[/name_f]
Amaranth
[name_f]Conwenna[/name_f]
[name_f]Morwenna[/name_f]
[name_f]Kerensa[/name_f]
[name_f]Senara[/name_f]
[name_f]Arantxa[/name_f]
[name_f]Elixane[/name_f]
[name_f]Melisende[/name_f]
[name_f]Leocadia[/name_f]
[name_f]Endellion[/name_f]
[name_f]Artemisia[/name_f]
[name_f]Callisto[/name_f]
[name_f]Calixta[/name_f]
[name_f]Cybele[/name_f]
[name_f]Acantha[/name_f]
[name_f]Selene[/name_f]
[name_f]Demetria[/name_f]
[name_f]Cytherea[/name_f]
[name_f]Nephele[/name_f]
[name_f]Astraea[/name_f]
[name_f]Evanthe[/name_f]
[name_f]Evadne[/name_f]
[name_f]Eleusine[/name_f]
[name_f]Melusine[/name_f]
[name_f]Parthenia[/name_f]
[name_f]Idony[/name_f]
[name_f]Isolde[/name_f]
[name_f]Nimue[/name_f]
Niniane
[name_u]Vivian[/name_u]
[name_f]Brighid[/name_f]
[name_f]Ravenna[/name_f]
[name_f]Nerys[/name_f]
[name_f]Theodosia[/name_f]
[name_f]Kezia[/name_f]
[name_f]Salome[/name_f]
[name_f]Hester[/name_f]
[name_f]Esther[/name_f]
[name_f]Hilde[/name_f]
[name_f]Beatrix[/name_f]
Calytrix
[name_f]Tanith[/name_f]
Rowena, Twyla, Guinevere, Ophelia, Odile, Odette, Calista
Belladonna
[name_f]Demelza[/name_f], [name_f]Davina[/name_f], [name_u]Salem[/name_u], [name_f]Nissa[/name_f], [name_f]Sabrina[/name_f], [name_f]Rhiannon[/name_f], Merope