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French word qui comes from Proto-Indo-European *kʷ-, Proto-Indo-European *kʷís, and later Proto-Italic *kʷis (Who, what (interrogative).)
*kʷ- (Proto-Indo-European)
*kʷís (Proto-Indo-European)
Who, what (interrogative). Who, which, that (relative) Which, what.
*kʷey (Proto-Indo-European)
*kʷis (Proto-Italic)
Who, what (interrogative).
*kʷoi (Proto-Italic)
Who, what (relative, indefinite).
quei (Old Latin)
(relative) who, what, that, which (interrogative) who, what, that, which.
qui (Latin)
(interrogative) who, what, which (relative) who, that, which.
ki (Old French)
qui (Middle French)
Which (when referring to a non-human). Who.
qui (French)
(interrogative) who, whom. (relative) who, whom (after a preposition), which, that.