Proto-Slavic *osьlъ

→ Belarusian асёл (inherited)

→ Bulgarian осел (inherited)

→ Czech osel (inherited)

→ Old Church Slavonic осьлъ (inherited)

→ Old Church Slavonic осьлѧ (derived)

→ Lower Sorbian wósoł (inherited)

→ Lithuanian asilas (cognate)

→ Polish osioł (inherited)

→ Polish osieł (inherited)

→ Russian осёл (inherited)

→ Serbo-Croatian osao (inherited)

→ Serbo-Croatian осао (inherited)

→ Slovene osel (inherited)

→ Ukrainian осел (inherited)