If I google for list of X11 window managers "xwm", there's a reference in the first hit. The quotes around xwm are useful to screen out false positives.
oh god. commence operation “spam the random name generator”!
Taking a closer look at the original xwm, this project has long since been dead. i wonder if it would be fair to say the acronym itself could be used, as tribute to the original? or is that too confusing?
https://web.archive.org/web/20020609220837/http://www.xwinma...
http://tech-insider.org/unix/research/acrobat/860201-a.pdf
After which there was xnwmm
http://www.mit.edu/afs.new/athena/system/x10r4/doc/mann/xnwm...
Then uwm
https://en.wikipedia.org/wiki/Ultrix_Window_Manager