The codenames for every major Debian release are named after characters from Pixar’s Toy Story franchise. Debian’s unstable release is fittingly named after Sid, an unstable character from the Toy Story movies.
Similarly, VLC names their releases after Discworld characters. It’s a fun way to make major versions feel like more than just a number increment.
The Vorbis audio codec was also named after Vorbis from Small Gods, the 13th Discworld book.
That’s contested but still very cool (and the people who disagree are wrong)