I believe the've been looking for two-letter names that aren't already taken, and are easy to type. I think I heard that from one of the podcasts that Charlie Marsh was on.
Source here for anyone interested[0]. From memory, Ruff was its own thing, (I think named after the bird?) since then they've tried to give projects short letter combinations for consistency and ease of typing (uv, ty, pyx)
I recently viewed tutorials on uv and ruff from Corey Schafer on youtube which were excellent
Hope to make these tools part of my defaults
Look forward a similar overview by Corey on ty :)
Curious ..is there any backstory to these library names?