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Latin word tu comes from Proto-Mongolic *ci (You (personal pronoun).), Proto-Uralic *tinä (You, thou.)
*ci (Proto-Mongolic)
You (personal pronoun).
*tinä (Proto-Uralic)
You, thou.
чи (Mongolian)
You (subject pronoun: the person being addressed) (informal).
тэт (Northern Yukaghir)
*túh₂ (Proto-Indo-European)
You, thou (second-person singular pronoun).
*tū (Proto-Italic)
You (second-person singular).
tu (Latin)
You (singular); thou.