köken: From Middle High German du, duo, dū, from Old High German dū (akin to Old Saxon thū and English thou), itself from Proto-West Germanic *þū, from Proto-Germanic *þū, from Proto-Indo-European *túh₂.
köken: From Old East Slavic вꙑ (vy), from Proto-Slavic *vy, from Proto-Indo-European *yúHs. Cognate with Sanskrit यूयम् (yūyam) and English you. Use of Вы as a formal singular is attested in East Slavic literature from the 11th-16th century, under influence of Byzantine speech. It started becoming widespread in Russian society during the rule of Peter the Great, under French and German influence, and…
köken: тоғыз (toğyz) + -ыншы (-ynşy). Cognate with Turkish dokuzuncu, Kyrgyz тогузунчу (toguzuncu), Turkmen dokuzynjy, Uzbek toʻqqizinchi and Azerbaijani doqquzuncu, etc.
köken: From тогуз (toguz) + -унчу (-uncu). Cognates include Turkish dokuzuncu, Kazakh тоғызыншы (toğyzynşy), Turkmen dokuzynjy and Azerbaijani doqquzuncu.
köken: Etymology tree Proto-Italic *nowenos Latin nonus Inherited from Proto-Italic *nowenos. De Vaan suggests that *noweno- first contracted into *nouno-, which then was restored to *noweno-, which then itself contracted into nōnus.