Uhm... If I'm not mistaken, her dead sister's name was Baal. But after Makato's death, Ei continued to rule under the name Baal. Beelzebul is Raiden Ei's name.
@@Ruthyonedits Oooooh thats so cool! Cause it suits her plus the name Baal in latin translates to (Lord of the flies) which I find funny but in greek mythology Beelzebub looks like a fly. Ok im getting off track, but thats super cool!