Daek is a demon in Mathers’ translation of the Sacred Magic of Abramelin the Mage. . He is one of many demons serving under the infernal ruler Astaroth. In various Abramelin material the name has different spellings including Barak and Ba-rook possibly indicating the name was originally derived from the Hebrew name Baruch, meaning “blessed.” A.G.H.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.