Where does “lunar” come from?

lunar (Spanish) comes from Latin lunaris, from Norman leune, from Old French lune, from Latin lūna, from Old Latin losna, from Proto-Italic louksnā, from Proto-Indo-European lówksneh₂, from Proto-Indo-European lewḱ- — bright; to shine; to see.

lunar (Spanish): lunar; mole, birthmark; polka dot