Where does “θεϝ-” come from?

θεϝ- (Ancient Greek) comes from Proto-Indo-European dʰew- — to die, pass away; to run, flow.

Ancestry of “θεϝ-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	dʰew-	to die, pass away; to run, flow

θεϝ- — Etymology, Origin & Word History | Etymology Explorer