Focusing on two Korean names of furbearing animals, namely cwokceypi ‘weasel, polecat’ and salk ‘leopard cat, wildcat’, this paper aims to describe their lexical histories in old written materials and modern dialectal variations, and to further investigate their ultimate etymology. cwokceypi is first attested in the 17th century as cywokcyepi, whose origin can be traced back to a borrowing from Tungusic (Udegheic to be specific) *čokčɪ ‘weasel’ suffixed with a Sino-Korean element –p(h)i (皮) ‘skin, leather, hide, fur.’ This hypothesis is supported both by the northern dialectal forms with –phi and by the historical fact that the 15th-16th centuries was a period of thriving fur trade between the Korean people and their Tungusic-speaking (“Jurchen”) neighbors in the north. Meanwhile, Middle Korean solk (>salk) generally corresponds to Classical Chinese li (狸), but its referent may have been wider than that of Contemporary Korean, ranging from leopard cats to raccoon dogs and perhaps even weasels in earlier times. Deeper etymology of solk is not so clear, although both external and internal hypotheses of origin are examined in this paper.