Nothing too fancy, just not dhuhdbvfybghdbhdgbhjgg. Also please try to stay away from super typical human names (I once made a demon called Lily; worst five minutes of my life.)
Help for angel and demon names
You could use Asha or Catriona for the angel. You could use Sephtis or Kritana for the demon names.
group
@Blossom_Utonium
Than, Lilith, Abraxas, Alastor, Hinn, Kroni, Ronove, Seir, or Shax
I like Cassiel , Azrael or Ahriel for an angel and Asmodeus , Azazel , Astaroth or agramon for a demon
Angel: Elpida, Asha, Chislon, Matthanias, Laelynn
Demon: Achlys, Adreanna, Braeden, Chiara, Daray
Angel: Coretha, Neriah, Lavina, Laylah, Purita, Chasan, Karael, Morael, Nanael, Anahel, Caphriel, Astera
Demon: Arnath, Sulrath, Selvak, Gerazek, Malkath, Malakath, Ulrath, Ralakath, Aronath, Elgerath, Azgorath
one thing you can do is take a typical name and rearrange it somewhat. depending on how youd like it pronounced, it could either be used as an angels name or a demon.
For example, i took the regular name of Alex and ran it backwards. comes out as Xela (pronounced zay-luh). i thought it sounded more demon-ish, so i went with it lolol