Where does “купа” come from?
купа (Old East Slavic) comes from Proto-Slavic kupa, from Proto-Indo-European keup-, from Proto-Indo-European keu- — bend; vault, hole; to shine; light; bright.
купа (Old East Slavic) comes from Proto-Slavic kupa, from Proto-Indo-European keup-, from Proto-Indo-European keu- — bend; vault, hole; to shine; light; bright.