No founder, establishing act, or first observance can be located for National Eli Day. The phrase circulates on holiday listing sites and on social media, but every trail leads to a page with no sourcing of its own, so the day is observed without a documented author.
Two names, one spelling
His name is written in Hebrew with an ayin, and it means ascension, from a verb meaning to ascend. A second Hebrew name is written with an aleph. That one means my God, and it is the element sitting inside Elijah.
English took both and wrote them the same way. So the priest of Shiloh is not a shortened Elijah, and never was.


