Where does “हेतु” come from?

हेतु (Sanskrit) comes from Sanskrit तु, from Sanskrit त्वम्, from Proto-Iranian tuHám, from Proto-Indo-Iranian túH, from Proto-Indo-European túh₂ — you, thou.

हेतु (Sanskrit): "impulse", motive, cause, cause of, reason for;...

Definitions

"impulse", motive, cause, cause of, reason for;...

Ancestry of “हेतु”, step by step

हेतु traces back through two separate lines of ancestry.

via Sanskrit तु

Step	Language	Word	Meaning
1	Sanskrit	तु	pray, I beg, do; but; and
2	Sanskrit	त्वम्	you, thou
3	Proto-Iranian	tuHám	—
4	Proto-Indo-Iranian	túH	you, thou
5	Proto-Indo-European	túh₂	you, thou

via Sanskrit हि

Step	Language	Word	Meaning
1	Sanskrit	हि	for, because, on account of; just, pray, do;...
2	Proto-Indo-Aryan	źʰí	—
3	Proto-Indo-Iranian	ȷ́ʰi	an emphatic particle
4	Proto-Indo-European	gʰe	Postpositional intensifying particle, indeed, at...

Words derived from “हेतु”

Every word from Proto-Indo-European túh₂ →Every word from Proto-Indo-Iranian túH →Every word from Proto-Iranian tuHám →