All over the world, Köllner (Köllner , Келлнер ) is an extremely rare unknown gender forename. Much more prevalently, Köllner is the last name as well as the forename.
Max, Ralf, Rolf, Rene, Dirk, Domi, Gabi, Gerd, Lara, Lena, Lisa, Luca, Lutz, Jana, Jost, Jens, Toni, Tino, Else, Hans, Inge, Ingo, Paul, Kurt, Karl, Bodo, Kai, Pia, Roy, Jan, Tom, Tim, Eva, Ina, Udo, Uwe, Olaf, Marc, Maik, Mike, Sven, Alex, Anna, Anne, Anni, Anja, Anke, Arne, Mark, and Otto