From Ottoman Turkish گݣیش (geñiş, “wide, ample, spacious”), itself inherited from Proto-Turkic *kẹ̄ŋiĺ, itself derived from Proto-Turkic *kẹ̄ŋ, whence genleşmek and dialectal gen.
Cognate with Azerbaijani geniş, Turkmen giň, Uzbek keng, Bashkir киң (kiñ), Yakut киэҥ (kieŋ).