|Well, congrats. You discovered it. You get to name it.|
Although this article is based on canonical information, the actual name of this subject is conjectural.
The false memory spell allows a witch to create false memories and images into another witch's mind. The witch Spencer Wallis had been using this on fellow witch James Frampton. This spell was noted by Bobby Singer, and according to Dean Winchester who was reading the notes, this could also target not just witches but other persons as well. Knowledge of this spell was not widespread, and not even a familiar was certain of the existence of the spell, although she suspected that the spell did exist.