- Proto Hind-Ewropaki ra *trei-dekm ("hirês")
- Proto-Aryaki ra *thrayah-dasa ("hirês")
- Zazaki: hirēs Alfabeyê Ariki
- Ewıstki: thridasa ("hirês")
- Pehlewki: sīčdahum ("hirês")
- Farski: sīzdah ("hirês")
- Kurmancki: sīzdah ("hirês") (< Farski ra)
- Sanskritki: tráyōdaśa ("hirês")
- Yunanki: triskaideka ("hirês")
- Latinki: tredecim ("hirês")
- Almanki: dreizehn ("hirês")
- İngılızki: thirteen ("hirês") ...
- Horn, Paul. Dictionary of Persian Etymology (Strassburg, 1893),
- Julius Pokorny's Indo-European Etymological Dictionary
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