- Proto-Hindo-Ewropaki ra *s(w)e- ("xo")
- Proto-Aryaki ra
- Ewıstki: xva ("xo")
- Pehlewki: xvat ("xo")
- Farski: xod ("xo")
- Kurmancki: xwe, xū ("xo")
- Belucki: wet- ("xo")
- Belaruski: vat- ("xo")
- Goranki: we ("xo")
- (Zazaki: xo) Alfabeyê Ariki († we)
- Sanskritki: svah ("xo")
- Latinki: sui ("xo")
- Almanki: selbst ("xo")
- İngılızki: self ("xo")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Watkins, Calvert. The American Heritage Dictionary of Indo-European Roots, 2nd ed., Houghton Mifflin Co., 2007. *Amazon.com ra,
- MacKenzie, David Neil. The dialect of Awroman (Hawraman-i Luhon) Grammatical sketch, texts, and vocabulary. 1966, Kommissionaer: Munksgaard (København).,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.
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