Here's another obscure one: J'zzalshrak, a female demon lord mentioned (not statted out) in the generic adventure "Bzallin's Blacksphere" in Dungeon 64 (2E). In the module she tries to bribe an archmage named Bzallin into helping her fight in the Blood War against the Baatezu. He refuses until he is attacked by the Baatezu attacked him. Then he ended up joining forces with her and becoming a lich after slowly becoming evil fighting the Baatezu.
To the best of my knowledge, I think J'zzalshrak was made up for that adventure and not mentioned since. This demon lady is apparently fond of using arcane gifts such as expensive spell components and evil magical tomes to persuade mortals to join her side. J'zzalshrak's main concern, unlike several demon lords, seems to be advancing her cause in the Blood War. The module also notes that she is "not known for her subtlety", referring to her tendency to hold a grudge and get even.