Nothing specifically "Fey Origin," but in my games I've always used Wild Magic for fey sorcerer powers.
— Dan Dillon (@Dan_Dillon_1) April 6, 2021
Depending on the specific fey flavor you want, Shadow and some hefty reskinning of Divine Soul and Clockwork Soul could go a long way toward hitting the right notes.
— Dan Dillon (@Dan_Dillon_1) April 6, 2021