Proto-Slavic *lǫkъ

→ Belarusian лук (inherited)

→ Bulgarian лък (inherited)

→ Czech luk (inherited)

→ Old Church Slavonic лѫкъ (inherited)

→ Finnish luokki (derived)

→ Macedonian лак (inherited)

→ Polish łuk (derived)

→ Polish łęk (inherited)

→ Russian лук (inherited)

→ Serbo-Croatian лук (inherited)

→ Serbo-Croatian luk (inherited)

→ Slovak luk (inherited)

→ Slovene lok (inherited)

→ Ukrainian лук (inherited)