Cloudy Yun

You can write Yun without using the Rain symbol! (Unihan 96f2). Though a spiral in seal form it's simply a cocoon plus a top stroke of the horizontal line that's one of the six basic strokes though the cursive forms revert back closer to the spiral of the older forms.
It's probably only an accident that Japanese Kumo seems similar to Latin Cumulus.

The * symbol by the way marks what linguists think was the oldest Sinitic form of Modern Yun.
Another possible reconstruction could be hwiang or huan or even hiwan.

But I'm guessing. Not having access to time travel we can only argue for the form that has the highest probablityof being closest to the most ancient forms of Chinese and whatever langauge.