- Proto-Hindo-Ewropaki ra *kwetwor-komt ("çewres")
- Proto-Aryaki ra
- Ewıstki: čathwarsata- ("çewres")
- Pehlewki: čihal, čil ("çewres")
- Partki: čafrast ("çewres")
- Farski: čihil, čil ("çewres")
- Kurmancki: čehil, čil ("çewres") (< Farski ra)
- (Zazaki: čawras) Alfabeyê Ariki
- Sanskritki: čatvārinśat ("çewres")
- Yunanki: tessarákonta ("çewres")
- Latinki: quadrāgintā ("çewres")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Julius Pokorny's Indo-European Etymological Dictionary
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