ANSWER: Huna is a Hawaiian word whose basic meaning is "something hard to see," and it is commonly used by Hawaiians to refer to esoteric knowledge, as in the phrase, "no'eau huna," meaning "hidden wisdom." It's application as a term for a whole system of esoteric knowledge and practice is modern. The first person to use it this way was Max Freedom Long. I have used it (with amused tolerance from my Hawaiian uncle) to describe the Kahili family tradition. In this tradition it is a set of observations about the nature of reality. In its present form of seven ideas or principles it was supposed to have come originally from the Pleaides and was incorporated into Hawaiian culture, although not all Hawaiians accept all seven ideas.
These same ideas can be found scattered around the world as part of different philosophies and cultures, because other people have made similar observations, but the only places I have found all seven ideas together are in the Gospels and in the Book of Proverbs.