At least for Nix itself, that's pretty much it except via Dutch.
> The name Nix is derived from the Dutch word niks, meaning nothing; build actions do not see anything that has not been explicitly declared as an input
Also, I think the founder's username in various places is nixnut. Which to an English-only speaker means someone crazy about Nix (Nix fan). However in Dutch 'niksnut' or 'nietsnut' loosely translates to 'bum'.
"gar" is a useful amplifying prefix in German that can be used in all kinds of situations and I think it lacks a direct equivalent in English. Unlike totally, for example, gar can only stand alone in very specific contexts and usually is used more like an intensifying prefix.
> The name Nix is derived from the Dutch word niks, meaning nothing; build actions do not see anything that has not been explicitly declared as an input
From page 81 of the original paper: https://edolstra.github.io/pubs/nspfssd-lisa2004-final.pdf