From Wiktionary, the free dictionary
From Proto-Turkic *-si. Cognate with Kyrgyz -си (-si), Turkish -si, Yakut -тэ (-te).
-сі • (-sı)
- his (denotes third-person possessive suffix)
- ана (ana, “mother”) + -сі (-sı) → анасы (anasy, “his mother”)
- -нің (-nıñ, “genitive case”)
- -ім (-ım, “first-person singular possessive suffix”)
- -іміз (-ımız, “first-person plural possessive suffix”)
- -ің (-ıñ, “second-person singular informal possessive suffix”)
- -іңіз (-ıñız, “second-person singular formal possessive suffix”)