@SarahMadelyn - The Locked Tomb is my all time favourite book series! I almost added them to the top post, but YES.
I love the side character names as well: Jeannemary, Magnus, Ianthe, Pyrrha, Mercymorn, Augustine, Loveday, Valancy. Kiriona Gaia from the later books - gorgeous. I can only describe the names as lushly Christian-inspired but like, for people with religious trauma.