Where does “ધન” come from?

ધન (Gujarati) comes from Sanskrit धन, from Sanskrit धन्, from Proto-Indo-European dʰenh₂- — to set in motion; to flow.

Ancestry of “ધન”, step by step

Step	Language	Word	Meaning
1	Sanskrit	धन	the prize of a contest; booty; contest, strife;...
2	Sanskrit	धन्	cl.1 P. धनति, to sound L; cl.3 P. दधन्ति. to...
3	Proto-Indo-European	dʰenh₂-	to set in motion; to flow

ધન — Etymology, Origin & Word History | Etymology Explorer