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?