The package is named quake and includes the vkQuake engine along with the LibreQuake game data.
It appears it can be installed side‑by‑side with our unofficial librequake package, which ships different engines — ironwail and quakespasm — and is available in the Mabox repo as well as standalone at:
I’ve made the quake package available in the Mabox repository so you can try it out before it lands in the Manjaro repositories, which may take a few weeks.
yay -S quake
I added a small improvement that places the game in the correct menu category: Games instead of Other.
