Also the names of the three Aegis cores: all three are ancient Greek words with theological meanings.
Ontos means "being" or "to be"; a suitable tag for Alvis, who existed as a neutral God of sorts.
Pneuma means "the vital spirit, soul, or creative force of a person", which again suits Pyra/Mythra's character.
Finally, Logos (Malos) has a number of meanings, but the most relevant in this case would probably be "logical argument". Born with immense destructive power and the anger at the world he inherited from Amalthus, Malos states that it seems only logical that his purpose was the destruction of the world.