Backstory:
There is French "qui", whose use is alligned with Turkish "ki". As a Turk, I guessed we might have imported the word. It had been resting at the back of my mind for quite some years now.
It turns out Turkish imported the word from Persian [1] and French must have taken from Latin.
Question:
This leads to a proxy question: "Did Latin borrow/lend word 'qui' from/to Persian 'که' (kë)?".
Hopefully this does not violate the exchange rules horribly, could not find an etymology site that mentions a relation nor an etymology stackexchange.