Where does “ওই” come from?

ওই (Bengali) comes from Bengali ও, from Magadhi Prakrit 𑀅𑀑.

ওই (Bengali): that

Definitions

that

Ancestry of “ওই”, step by step

Step	Language	Word	Meaning
1	Bengali	ও	he, she, it; and, also
2	Magadhi Prakrit	𑀅𑀑	—

Words derived from “ওই”

Every word from Magadhi Prakrit 𑀅𑀑 →

ওই — Etymology, Origin & Word History | Etymology Explorer