Fanciful Etymologies

A recent internet meme has suggested that “tag” (as in the game of tag) is an acronym for “touch and go”. In this article, Ben Zimmer discusses this myth and some other fanciful etymologies:
https://www.theatlantic.com/entertainment/archive/2018/08/that-meme-youre-sharing-is-probably-bogus/566582/
And, by the way, “tip” doesn’t stand for “to insure promptness” either:
https://www.snopes.com/fact-check/tip-sheet/
How such etymologies develop is an interesting question!