In the world, Köpper (Köpper 
) is an extremely rare unknown gender first name. Much more prevalently, Köpper is the last name as well as the forename.
Jan, Ronald, Renate, Dieter, Jeremy, Julian, Thomas, Nadine, Nicole, Norman, Evelyn, Helmut, Fabian, Ursula, Manfred, Michael, Steffen, Anthony, Carsten, Patrick, Jürgen, Torsten, Rainer, Cassie, Aileen, Svenja, Anja, Anke, Axel, Karl, Knut, Ralf, Rico, Nils, Bernd, Klaus, Wilhelm, Linda, Jörg, Ernst, Hanna, Heinz, Horst, Fritz, Willi, Manuel, Sandra, Stefan, Liane, and Christel