Here's a funny thing I just found out: in chasing the reference cited by Wikipedia regarding the naming, I learned that UTF-8 was invented for Plan 9.
https://www.cl.cam.ac.uk/~mgk25/ucs/utf-8-history.txt
Rob Pike opens with:
> Looking around at some UTF-8 background, I see the same incorrect story being repeated over and over. The incorrect version is: 1. IBM designed UTF-8. 2. Plan 9 implemented it.
> That's not true. UTF-8 was designed, in front of my eyes, on a placemat in a New Jersey diner one night in September or so 1992.