All around the world, Heißler (Heißler 
) is an extremely rare unknown gender first name. Much more frequently, Heißler is the last name as well as the forename.
Jan, Werner, Maritta, Martina, Marlene, Manfred, Michael, Patrick, Dimitri, Dominik, Jürgen, Torsten, Natalja, Norbert, Herbert, Marianne, Matthias, Michelle, Stefanie, Rüdiger, Alexander, Christian, Johann, Karlheinz, Lothar, Dieter, Karl, Kurt, Lara, Jens, Hans, Artur, Roman, Lucia, Jakob, Josef, Tanja, Nelli, Erwin, Heinz, Frank, Fritz, Andrea, Birgit, Robert, Renate, Rudolf, Liesel, and Friedrich