From Proto-Athabaskan *qʼəš ~ *qʼəɣəšʷ (“alder”). Has been compared to Ket ӄыʼй (qɨˀj, “birch bark”). Compare also Ahtna kʼes
Perhaps this word is related to the root -KʼǪSH (“to be sour, be rancid (of color and oil)”).
kʼish