Proto-Slavic *ulьjь

→ Belarusian вулей (inherited)

→ Bulgarian улей (inherited)

→ Czech úl (inherited)

→ Lower Sorbian wul (inherited)

→ Lithuanian avilys (cognate)

→ Polish ul (inherited)

→ Russian улей (derived)

→ Slovak úľ (inherited)

→ Ukrainian вулик (inherited)