Proto-Slavic *okъno

→ Belarusian акно (inherited)

→ Czech okno (inherited)

→ Czech okno (inherited(cs/zlw-ocs))

→ Kashubian òkno (inherited)

→ Lower Sorbian wokno (inherited)

→ Finnish akkuna (derived)

→ Upper Sorbian wokno (inherited)

→ Hungarian akna (cognate)

→ Macedonian окно (inherited)

→ Old East Slavic окъно (inherited)

→ Polish okno (inherited)

→ Polabian våknü (inherited)

→ Russian окно (inherited)

→ Serbo-Croatian okno (inherited)

→ Serbo-Croatian окно (inherited)

→ Slovak okno (inherited)

→ Slovene okno (inherited)

→ Ukrainian вікно (inherited)

→ Votic akkuna (derived)

→ Slovincian vʉ̀ɵ̯knɵ (inherited)