Set _NET_WM_NAME to the currently running command in Linux

I am on Arch linux with X and dwm. I want to have the title of the window in st, the suckless terminal, to reflect the command I am running, instead of a plain st. For example if I am running htop to monitor my cpu usage, I want the title to be htop - st. How would I do this? Edit: I would like this to be handled by my Xorg server rather than trap a function on a terminal being opened