Where does “semiluna” come from?

semiluna (Spanish) comes from Spanish luna, from Aragonese luna, from Latin lūna, from Old Latin losna, from Proto-Italic louksnā, from Proto-Indo-European lówksneh₂, from Proto-Indo-European lewḱ-, from Proto-Indo-European lewk- — bright; to shine; to see.

semiluna (Spanish): half-moon