The demon Camio appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, Pseudomonarchia Daemonum, The Lesser Key of Solomon, and Dictionnaire Infernal
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Fifty -third Spirit is Camio, or Cai' m. He is a Great President, and appeareth in the Form of the Bird called a Thrush at first, but afterwards he putteth on the Shape of a Man carrying in his hand a Sharp Sword. He seemeth to answer in Burning Ashes, or in Coals of Fire. He is a Good Disputer. His Office is to give unto Men the Understanding of all Birds, Lowing of Bullocks, Barking of Dogs, and other Creatures; and also the Voice of the Waters. He giveth True Answers of Things to Come. He was of the Order of Angels, but now ruleth over 30 Legions of Spirits Infernal. His Seal is this, which wear thou, etc.
Timeline of related events
1536Publication of De praestigiis daemonum (lists this demon)
1584Publication of The Discoverie of Witchcraft (lists this demon)
1641Publication of the Lesser Key of Solomon (lists this demon)