Etymology

Via an intermediary language, from Turkic *quduğ "well" (compare Old Turkic quduğ, quδuğ ‎(“well”)), from Proto-Turkic *Kud- ‎(“to pour”).

Compare ҡойо ‎(qoyo), the native Kypchak development from the same archetype.

The intermediary could have been a Mongolic language (compare Mongolian худаг ‎(hudag, “well”)) or, less probably, written Turkic (Chagatai > Volga Turki) traditions.

Compare with Kazakh құдық ‎(құdıқ), Kyrgyz кудук ‎(kuduk), Uzbek quduq, Kyrgyz, Tuvan, Yakut кудук ‎(kuduk, “well”), etc.