Where does “deniz” come from?

deniz (Turkish) comes from Ottoman Turkish دكز, from Proto-Turkic teŋiŕ, from Old Turkic teŋ, from Middle Chinese 等.

deniz (Turkish): sea

Definitions

Step	Language	Word	Meaning
1	Ottoman Turkish	دكز	sea
2	Proto-Turkic	teŋiŕ	sea
3	Old Turkic	teŋ	equivalent, balanced; equal, equivalent,...
4	Middle Chinese	等	—

deniz — Etymology, Origin & Word History | Etymology Explorer