The Kipchaks interpreted their name as meaning "hollow tree" (Middle Turkic: "kuv ağaç"); according to them, inside a hollow tree, their original human ancestress gave birth to her son. Németh points to the Siberian "qıpčaq" "angry, quick-tempered" attested only in the Siberian Sağay dialect (a dialect of Khakas language) . Klyashtorny links Kipchak to "qovı", "qovuq" "unfortunate, unlucky"; yet Golden sees a better match in "qıv" "good fortune" and adjectival suffix "-čāq". Regardless, Golden notes that the ethnonym's original form and etymology "remain a matter of contention and speculation".