
Originally Posted by
Ferth
Enochian was supposedly the language of Angels as purported by a 16th century medium who claimed that the language was what Adam spoke in the Garden of Eden and the language in which he named all of the animals.
To build on that, "Enochian" comes from the name "Enoch", the great-grandfather of the Biblical Noah. Enoch is pronounced ee-naak or ee-nock, and the BLM ability is pronounced ee-naak-kian or ee-noc-kian. Just a friendly PSA, as I've noticed a lot of people reading it as eno-chain instead. 
There is such a thing as Enochian magic in real life. As Ferth explained, it's supposed to allow the occult practitioner to invoke and command spirits.
Here are my contributions to the arcane terms used in FFXIV:
(1) Noumenon is an actual concept that featured heavily in the epistemological philosophy of Immanuel Kant.
The German thinker was a giant of his time, and among his greatest contributions were his musings on the nature of knowledge. Basically, he's one of the strongest proponents of the "two worlds" of things, phenomenon and noumenon. Phenomenon describe things as we perceive them to be, while noumenon are the true nature of the things we perceive.
In Kant's view, phenomenon are the "wrappers" around the black box that is the "thing-in-itself". As human beings, limited by our physical senses, we will never be able to perceive the "thing-in-itself". What we know about the objects around us are limited to what we can perceive them to be.
(2) This view is, interestingly, an echo of the ancient Greek concept of Mimesis (MAI-mee-sis). Mimesis derives from the Greek word for imitation, and Plato used the concept to criticise poetry as an imitation of reality, twice-removed from the truth of what things really are.
Plato argued that an idea exists in its truest form as something in the mind of God. Take the divine idea of a chair. A carpenter is inspired by this divine idea to create the object that we know as the chair. An artist comes along and is so impressed by the chair that he makes a perfect painting of the chair. But, despite the painting's perfection, it remains no more than an imitation of an imitation of the true idea of a chair as it exists in God's mind.
The point that Plato was trying to make is that artists have a duty to be as good as they can be, because while they help to spread knowledge through their creations, they are already two steps removed from the "truth", and can risk further distorting knowledge if they aren't as accurate as possible in their depiction of an idea.
Being a summoner main, it shouldn't be surprising that I'm intrigued by the choice of "Mimesis" as the name of the i270 summoner relic. It references, I think, the idea of egi being "imitations" of the real thing, the primals, who are in turn imitations of beings that once existed in Hydaelyn's history.