The demon Amy appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Fifty-eighth Spirit is Amy, or Avnas. He is a Great President, and appeareth at first in the form of a Flaming Fire; but after a while he putteth on the Shape of a Man. His Office is to make one Wonderful Knowing in Astrology and all the Liberal Sciences. He giveth Good Familiars and can bewray Treasure that is kept by Spirits. He governeth 36 Legions of Spirits, and his Seal is this, etc.