- Proto-Hindo-Ewropaki ra *kop- ("kewtene, bırnayene")
- Proto-Aryaki ra *kap- ("kewtene, gınayış")
- Partki: kf- ("kewtene")
- Pehlewki: kf-, kp- ("kewtene")
- Belucki: kap- ("kewtene")
- Kurmancki: Kurm. ka-, Sor. kaw- ("kewtene")
- Goranki: kaw- ("kewtene")
- (Zazaki: kaw-) Alfabeyê Ariki
- Latinki: kapat ("kewtene")
- Yunanki: kopto ("kewtene")
- J. Cheung, Etymological Dictionary of the Iranian Verb. Leiden 2007.,
- Watkins, Calvert. The American Heritage Dictionary of Indo-European Roots, 2nd ed., Houghton Mifflin Co., 2007. *Amazon.com ra,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.
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