Polish kier

← French cœur (borrowed)

← Middle French coeur (derived)

← Middle French cœur (mention)

← Old French cuer (derived)

← Old French coer (mention)

← Old French quer (mention)

← Proto-Indo-European *ḱḗr (derived)

← Proto-Italic *kord (derived)

← Latin cor (derived)

→ Polish karo (link)