While looking something up, I found https://www.who.int/en/activities/track ... -variants/
w/a table of all the Greek alphabet-named variants, so far. There's been a move away from country names to Greek letters.
Delta seems to be the one I hear most about in the news, but due to the capitalization, Delta Airlines always comes to my mind. I definitely didn't know the mappings of any of the ones currently under Variants of Interest. All of this has created more confusion, IMHO.