- Proto Hind-Ewropaki ra *leuk- ("vırsayene, roşn dayene")
- Arikiyo Kehan ra *rauč- ("vırsayene")
- (Zazaki: roja) Alfabeyê Ariki
- Ewıstki: raoč- ("vırsayene, roşn dayene"), raočah- ("roşn")
- Farskiyo Kehen: raočah- ("roce")
- Partki: rwč ("roce")
- Pehlewki: rwč ("roce")
- Soğdki: rwč ("roce")
- Farski: rōz ("roce")
- Kurmancki: rož ("roce")
- Soranki: rož ("roce")
- Belucki: roč ("roce")
- Goranki: ro ("roce"), rojiār ("tici")
- Sanskritki: ročis ("vırsayene, roşn dayene")
- Ermenki: lois ("roşn")
- Yunanki: leukos ("roşn, sıpê")
- Latinki: lux ("roşn")
- Almanki: Licht ("roşn")
- İngılızki: light ("roşn")
- J. Cheung, Etymological Dictionary of the Iranian Verb. Leiden 2007.,
- 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,
- Etymonline. Online English Etymology Dictionary. <etymonline.com> by Douglas Harper.
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