эсәк • (esäk)
From Common Kypchak *ičäk (see the below list of immediate cognates), an alteration of earlier *ičegi (~ Old Turkic ičägü "viscera, bowels"), from Proto-Turkic *ič (“interior; bowels; stomach”).
Kazakh ішек (işek), Kyrgyz ичек (içek), Uzbek ichak, etc. Khakas іӌеғ (íceğ)