- Proto-Hindo-Ewropaki ra *septm-ti- ("hewtay")
- Proto-Aryaki ra
- Ewıstki: haptāiti- ("hewtay")
- Pehlewki: haftād ("hewtay")
- Farski: haftād ("hewtay")
- Kurmancki: haftē ("hewtay") (< Farski ra)
- (Zazaki: hawtāy) Alfabeyê Ariki
- Sanskritki: saptati- ("hewtay")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Julius Pokorny's Indo-European Etymological Dictionary
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