Deccal is a demon in Mathers’ translation of the Sacred Magic of Abramelin the Mage. Mathers translates the name as meaning “the Fearful One.” Also the name may relate to the Latin word decas, “ten.” Deccal serves in a huge multitude of demons under the demonic princes of the four cardinal directions Oriens, Paimon, Ariton, and Amaimon. A.G.H.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.