köken: From Middle High German wisele, from Old High German wisula, wisala, from Proto-West Germanic *wisulā. Compare Low German Wessel, Wissel, Dutch wezel, English weasel, Swedish vessla.
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: Inherited from Old Czech kolčava. Further origin uncertain; possibly cognate with klát (“to strike, stab, spike”) from Proto-Slavic *kolti, ultimately from Proto-Indo-European *kelh₂-.
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.
köken: From Old Galician-Portuguese donezỹa (13th century, Cantigas de Santa Maria, where it is presented as a characteristically Galician word), from Vulgar Latin *domnicella (“weasel”), reanalyzed as *donic- + -ella, and them suffixed with -iña. Compare Portuguese donezinha.