weasel, specifically a Siberian weasel, Mustela sibirica.
köken: First attested in the Dong'ui bogam (東醫寶鑑 / 동의보감), 1613, as Early Modern Korean 죡져비 (Yale: cyokcyepi). Ultimately from *죡져 (*jokjeo, “weasel”) + 피(皮) (pi, “leather, skin”). The first component, *족져, was likely borrowed from a Tungusic language through trade. Compare Udihe čokči (“weasel”), Oroch čokčui (“polecat”), and Manchu ᡧᠣᠰᡳᡴᡳ (šosiki, “chipmunk”). The semantic broadening of "animal's skin"…
köken: From lumi (“snow”) + -ikko. The name is probably derived from the white winter fur of the animal, and the fact that it is quite rare to see it in the summer.
köken: From nevastă + -uică, probably based on a superstitious euphemism. Calque of Bulgarian невестулка (nevestulka), Ottoman Turkish كلینجك (gelincik) or Greek νυφίτσα (nyfítsa). Similar words can also be found throughout the Mediterranean: Italian donnola, Portuguese doninha, Spanish comadreja.