köken: Syncope of siebente, from Middle High German sibente, sibende, from Old High German sibunto, from Proto-West Germanic *sebundō, from Proto-Germanic *sebundô. Equivalent to sieben + -te.
köken: Morphologically yeddi + -inci. Cognate with Old Turkic 𐰘𐰃𐱅𐰨 (yetinči, “seventh”), Turkish yedinci, Turkmen ýedinji, Kazakh жетінші (jetınşı), etc.
köken: жеті (jetı) + -інші (-ınşı). Cognate with Turkish yedinci, Kyrgyz жетинчи (jetinci), Turkmen ýedinji, Uzbek yettinchi, Azerbaijani yeddinci, etc.
köken: Morphologically yetti + -inchi. Cognates include Turkish yedinci, Kyrgyz жетинчи (jetinci), Turkmen ýedinji, Kazakh жетінші (jetınşı) and Azerbaijani yeddinci.
köken: From Proto-Finnic *säiccemenci. Equivalent to seitsemä- (“seven”) + -s (“-th”), with third syllable *-e- analogically adjusted to -ä- (see seitsemän).
köken: From Proto-Italic *septVmos from Proto-Indo-European *septmós. By surface analysis, septem (“seven”) + -us. Cognates include Old Church Slavonic седмъ (sedmŭ) (< *sebdmъ < *septmъ) and the proper name Septimius, from a modification of Septimus.