OK. Why is it called the Elephant Gambit? Serious question. There must be some reason.
l don't know, but I can tell you that I remember seeing the name used in a book about it, about three decades ago. Here is an article about the opening. (I don't see an explanation of the name.)
http://www.chesscafe.com/text/kibitz15.txt
Personally I am always staggered by the number of outwardly sane people who fall the snake oil chess openings and click bait of Clyde "Harry Mudd" Nakamura.
Any one who refers to an established opening as "his" is a couple of pawns short of a second rank.