Proto-Slavic *kyjь

→ English Kiev (derived)

→ Belarusian кій (inherited)

→ Czech kyj (inherited)

→ Kashubian czij (inherited)

→ Lower Sorbian kij (inherited)

→ Upper Sorbian kij (inherited)

→ Lithuanian kūjis (cognate)

→ Polish kij (inherited)

→ Russian кий (inherited)

→ Russian кий (inherited(ru/uk))

→ Ukrainian Київ (inherited)