French pourquoi

← Middle French parquoy (mention)

← Old French por quoi (mention)

→ English pourquoi story (mention)

→ South Levantine Arabic ليش (cognate)

→ North Levantine Arabic ليش (cognate)

→ Greek γιατί (mention)

→ French pk (mention)

→ French quoi faire (mention)

→ French pour quoi faire (mention)

→ Ido pro quo (calque)

→ Norman pourtchi (cognate)