Proto-Slavic *ěsnъ

→ Belarusian ясны (inherited)

→ Bulgarian ясен (inherited)

→ Czech jasný (inherited)

→ Kashubian jasny (inherited)

→ Old Church Slavonic ꙗснъ (inherited)

→ Lower Sorbian jasny (inherited)

→ Lithuanian aiškus (cognate)

→ Macedonian јасен (inherited)

→ Polish jasny (inherited)

→ Russian ясный (inherited)

→ Serbo-Croatian jasan (inherited)

→ Serbo-Croatian јасан (inherited)

→ Serbo-Croatian jasno (inherited)

→ Slovene jasen (inherited)

→ Ukrainian ясний (inherited)