- Proto Hind-Ewropaki ra *trei-es ("hirê")
- Proto-Aryaki ra *tr-aya ("hirê")
- Zazaki: hīrē Alfabeyê Ariki
- Ewıstki: thri ("hirê")
- Farskiyo Kehen: śi ("hirê")
- Partki: hrē ("hirê")
- Soğdki: əthrē, šē ("hirê")
- Pehlewki: sē ("hirê")
- Farski: se ("hirê")
- Kurmancki: sē ("hirê") (< Farski ra)
- Peştunki: dre ("hirê")
- Goranki: yarē ("hirê") ...
- Sanskritki: tri, tr-aya ("hirê")
- Yunanki: treis ("hirê")
- Latinki: tres ("hirê")
- Almanki: drei ("hirê")
- İngılızki: three ("hirê")
- 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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