- Proto Hind-Ewropaki ra *duo-dekm ("dıwês")
- Proto-Aryaki ra *duwa-dasa ("dıwês")
- Zazaki: diwēs Alfabeyê Ariki
- Ewıstki: dvadasa ("dıwês")
- Soğdki: dw'ts ("dıwês")
- Pehlewki: duvāzdah ("dıwês")
- Farski: duvāzdah ("dıwês")
- Kurmancki: duvānzdah ("dıwês") (< Farski ra)
- Belaruski: duāzdah ("dıwês") (< Farski ra)
- Sanskritki: dvādaśa ("dıwês")
- Yunanki: duēdeka ("dıwês")
- Latinki: duodecim ("dıwês")
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Lubotsky, Alexander. Indo-Aryan inherited lexicon . University of Leiden.
- Lubotsky, Alexander. The Indo-Iranian substratum. 1999. [1],
- Julius Pokorny's Indo-European Etymological Dictionary
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