"Klamath" on a tech news site still triggers Pentium II memories for me: https://en.wikipedia.org/wiki/Pentium_II
A place I used to work had the internal name of a release called Ulaanbaatar. AFAIK, nobody on the dev team was from Mongolia, but this sort of thing was the norm.
Recent OSX releases are all various places (High Sierra, Big Sur, Mojave, etc.)
Azure regional codenames are "Black Forest" and "Fairfax" for Germany and USGov sovereign clouds.
...and so on.