Window management is even greater s*show. To the point that you need 3rd party apps to make it usable.
xprop -f _NET_WM_NAME 8u -set _NET_WM_NAME "New Window Name"
I'm not sure why anyone would do this, and I'm also not sure what the GP comment means by "naming windows" anyway. KDE does allow assigning shortcuts to windows, but I've never used this either.