dybbuk
A malicious possessing spirit, believed to be the dislocated soul of a dead person.
And who am I? A dybbuk—a demon of all shapes and no shape. My profession is forced entry into the minds of mortals; my speciality is Jews.
Where it comes from
From Yiddish דיבוק (dibek), from Hebrew דבק (dovek, “cling”).
Adapted from the Wiktionary entry dybbuk (CC BY-SA 4.0).