- Proto Hind-Ewropaki ra *dekm ("des")
- Proto-Aryaki ra *dasa ("des")
- Zazaki: das Alfabeyê Ariki
- Ewıstki: dasa ("des")
- Farskiyo Kehen: daθa ("des")
- Pehlewki: dah ("des")
- Partki: das ("des")
- Hausaki: dhs ("des")
- Farski: dah ("des")
- Kurmancki: dah ("des") (< Farski ra)
- Belucki: deh ("des") (< Farski ra)
- Sımnanki: das ("des")
- Sanskritki: dasa ("des")
- Ermenki: tasn ("des")
- Yunanki: deka ("des")
- Latinki: decem ("des")
- Almanki: zehn ("des")
- İngılızki: ten ("des")
- 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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