Nişanyan suggests a derivation *köt-(“to raise”) + *-üĺč- comparing Bulgarكوالج(köwelç-),[1] however according to Tekin it should be considered a metathesis *köweçil-, with the passive suffix *-il-.[2]
^ Erdal, Marcel (1993) Die Sprache der wolgabolgarischen Inschriften (in German), Wiesbaden: Harrassowitz Verlag, →ISBN, pages 121-122
^ Tekin, Talât (1988) Volga Bulgar kitabeleri ve Volga Bulgarcası [Volga Bulgarian Ephitaphs and Volga Bulgarian Language][1] (in Turkish), Ankara: Türk Tarih Kurumu Basımevi, →ISBN, page 35
^ Sanžejev, G. D., Orlovskaja, M. N., Ševernina, Z. V. (2016) Etimologičeskij slovarʹ mongolʹskix jazykov: v 3 t. [Etymological dictionary of Mongolic languages: in 3 vols.] (in Russian), volume II, Moscow: Institute of Oriental Studies of the Russian Academy of Sciences, page 144
Clauson, Gerard (1972) “köç-”, in An Etymological Dictionary of pre-thirteenth-century Turkish, Oxford: Clarendon Press, page 694
Doerfer, Gerhard (1967) Türkische und mongolische Elemente im Neupersischen [Turkic and Mongolian Elements in New Persian] (Akademie der Wissenschaften und der Literatur: Veröffentlichungen der Orientalischen Kommission; 20)[2] (in German), volume III, Wiesbaden: Franz Steiner Verlag, § 1660, pages 621-625
Räsänen, Martti (1969) Versuch eines etymologischen Wörterbuchs der Türksprachen (in German), Helsinki: Suomalais-ugrilainen seura, pages 285-286
Sevortjan, E. V. (1980) Etimologičeskij slovarʹ tjurkskix jazykov [Etymological Dictionary of Turkic Languages] (in Russian), volume III, Moscow: Nauka, page 88
