Besides the listed languages in EC the word is present also in Lak. (kutan), Av. (kután). The Lak. and Av. word are probably borrowed (cf. the secondary devoicing of k-, resembling the devoicing in the PL form: it is, however, hardly possible to deduce PL *kʷitan from Lak. or Av., thus the loan was probably reverse). The PNC reconstruction given here is highly tentative, primarily, because of the irregular correspondence between EC and WC. The word is also present in other languages of the Caucasus: Georg. gutani, Osset. gūton / goton, Arm. gutan, Azerb. kotan, but does not have a secure etymology in any of these languages. See Genko 1930, Abayev 1, 527: "a common Caucasian word of unknown origin".