Akium is a demon appearing in Mathers' translation of the Sacred Magic of Abramelin the Mage. The demonic name is interpreted as "certainty" with a variation spelling of Akahim. This demon is among the servitors of Beelzebub. A.G.H.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.