- Proto-Hindo-Ewropaki ra *ni- ("war, cêr")
- Proto-Aryaki ra *ni- ("war, cêr")
- Ewıstki: ni- ("war, cêr")
- Fangki: ni- ("war, cêr")
- Pencabki: ni- ("war, cêr")
- Farski: ni- ("war, cêr")
- Osetki: ni- ("war, cêr")
- (Zazaki: ni-) Alfabeyê Ariki
- Sanskritki: ni- ("war, cêr")
- Yunanki: neiothen ("cêr ra")
- Almanki: nieder ("war, cêr")
- İngılızki: neath ("war, cêr")
- 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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