Proto-Slavic *lučь

→ Bulgarian лъч (inherited)

→ Old Church Slavonic лоуча (inherited)

→ Lithuanian laukas (cognate)

→ Macedonian лач (inherited)

→ Russian луч (inherited)

→ Serbo-Croatian luč (inherited)

→ Serbo-Croatian луч (inherited)

→ Slovak lúč (inherited)

→ Slovene luč (inherited)