Comment: The paradigm of PL *zo-n is: dir. *zo(n), obl. *za-, gen. *=iz. Cf. Lezg. zun,za, gen. zi(n); Tab. uzu, gen. jiz; Ag. zun,za-, gen. jaz; Rut. zɨ,za, gen. iz-dɨ; Tsakh. zɨ,za-, gen. jiz-ɨn; Arch. zon,za-, gen. -is: (with a specific phonetic development); Kryz. zɨn,zä-; Bud. zɨn,zǝ-; Ud. zu,za-, gen. bezi.
Another archaic PL stem, dative *=ez, has been preserved only in Arch. (as =ez) (although it is possible that Ud. gen. b-ezi is a result of merger of PL *=iz and *=ez).