Storm! That should be fun, right?
Storm comes from the Old English word storm…which has the same meaning as we have. Sometimes they don’t even try to change things. Anyway! Before that, it comes from the Proto Germanic sturmaz, still meaning storm, and the Proto Indo European stur-mo-, which comes from the word stwer, turn or whirl (and which is also the ancestor of the word stir). Interesting how some words hardly change over thousands of years, and others like quit people can’t make up their minds on how to use.
Tony Jebson’s page on the Origins of Old English
University of Texas at Austin Linguistic Research Center