Agei
Agei: A demon whose name appears in the Mathers translation of the Sacred Magic of Abramelin the Mage. Agei appears in the court of the demons Astaroth and Asmodeus, and he serves both of these infernal masters. According to another version of the Abramelin material kept at the Wolfenbüttel library in Germany, the name of this demon should be spelled Hageyr.
SOURCE:
The Dictionary of Demons written by Michelle Belanger