Where does “روشن” come from?
روشن (Classical Persian) comes from Middle Persian lwšn', from Old Persian *rauxšnā, from Proto-Iranian ráwxšnaH, from Proto-Indo-Iranian ráwkšnaH, from Proto-Indo-European lówksneh₂, from Proto-Indo-European lewḱ-, from Proto-Indo-European lewk- — bright; to shine; to see.
Ancestry of “روشن”, step by step