- Proto Hind-Ewropaki ra *septm ("hewt")
- Arikiyo kehan (par) ra *hafta ("hewt")
- Zazaki: hawt Alfabeyê Ariki
- Ewıstki: hapta ("hewt")
- Partki: hft ("hewt")
- Farski: haft ("hewt")
- Kurmancki: haft ("hewt") (< Farski ra)
- Belaruski: hept ("hewt")
- Goranki: hawt ("hewt")
- Sanskritki: sapta ("hewt")
- Yunanki: hepta ("hewt")
- Latinki: septem ("hewt")
- Almanki: sieben ("hewt")
- İngılızki: seven ("hewt")
- 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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