I suspect that the name came directly by way of spirit informants. Otherwise this item is very important although all the other names are human constructs and mislead.
"If thou shalt perfectly observe these rules, all the following Symbols and an infinitude of others will be granted unto thee by the Holy Guardian Angel; thou thus living for the Honour and Glory of the True and only God, for thine own good, and that of thy neighbour. Let thy Fear of God be ever before the eyes and heart of him who shall possess the Divine Wisdom and Sacred Magic."
"The Unconscious, so-called, and that other self are the same. Or rather: what Freud and Jung found in each person’s psyche, beyond the reach of waking awareness – what they therefore called “subconscious” or “unconscious” – is really an aspect of the life of another being within him, another self from which the ego has split off, but which is still there, still active, still thinking, still in its own way conscious.
"Viewed under a different aspect, that inner being is also the guardian angel. Scientists may be right when they contend that you and I (meaning what those words commonly mean) have no preternormal powers. But we each carry within us an allied being who has. That is why occult phenomena continue to happen … The first step is to think of your mighty invisible companion as present, inside you. And the first commandment which follows is: LISTEN, LISTEN TO THAT COMPANION."