At the very least, Elune appears to have very strong ties to both Life and Light. Shadowlands did more or less state that she's the Winter Queen's sister from the realm of Life, yet Legion showed that she most likely created the Prime Naaru (Khadgar found it as a theory, which was all but confirmed when his idea to use the Tears of Elune on Light's Heart worked). And there's also her relationship with Eonar, who loved her according to the Elun'ahir book.
Also, didn't the Night Warrior lore from Shadowlands show that she has worshippers on other worlds as well? If I'm remembering that right, that should rule out her being anything too specific to Azeroth in particular.