Proto-Slavic *bьrlogъ

→ Czech brloh (inherited)

→ Hungarian barlang (derived)

→ Polish barłóg (inherited)

→ Romanian bârlog (derived)

→ Serbo-Croatian brlog (inherited)

→ Serbo-Croatian брлог (inherited)

→ Slovak brloh (inherited)

→ Slovene brlog (inherited)

→ Albanian bërllog (derived)