From Sogdian δβar, Proto-Iranian *dwar-, from Proto-Indo-Iranian *dʰwar-, from Proto-Indo-European *dʰwer- (“gate, door”). Cognate with Tajik дар (dar), Ossetian дуар (dwar), Avestan 𐬛𐬎𐬎𐬀𐬭𐬆𐬨 (duuarəm), Russian дверь (dverʹ).
давар (davar)