From Proto-Turkic *čibi
Cognate with Karachay-Balkar чюй (çüy, “nail”), Kumyk чюй (çüy, “nail”),Uzbek chuv (“linchpin”), Turkmen çüý (“nail”), Turkish çivi, Bashkir сөй (söy),Tatar чөй (çöy), Nogai шуьй (şüy).
сии • (sii)
сии́ • (sií)