Where does “ինչու” come from?

ինչու (Armenian) comes from Middle Armenian ինչու, from Old Armenian ինչ, from Old Armenian ի-, from Old Armenian հի-, from Proto-Indo-European *kʷís.

ինչու (Armenian): why

Definitions

Ancestry of “ինչու”, step by step

Step	Language	Word	Meaning
1	Middle Armenian	ինչու	—
2	Old Armenian	ինչ	some, a, an, one, certain, single, any; what?...
3	Old Armenian	ի-	thing; what?
4	Old Armenian	հի-	something
5	Proto-Indo-European	*kʷís	—

Every word from Proto-Indo-European *kʷís →Every word from Old Armenian ի- →Every word from Old Armenian ինչ →