I was browsing through the dictionary display at the local bookstore. They were featuring the Random House Unabridged. I judge a dictionary by the way it handles etymology. Don't ask me why I decided to check the derivation of HELLO. Perhaps the book was open at that page.
Word Ways: Vol. 12
, Article 4.
Available at: https://digitalcommons.butler.edu/wordways/vol12/iss4/4