All around the world, Gewiss (Gewiss 
) is an extremely rare unknown gender given name. More frequently, Gewiss is the last name as well as the forename.
Mr, Brenda, Pascal, Rachel, Robert, Denise, Daniel, Danice, Gerald, Janice, Thomas, Edward, Harold, Holger, Freddy, Mathias, Matthew, Michael, Mickael, Annette, Cécile, Bernard, Agathe, Andrew, Sabine, Maxime, Ms, Amy, Tim, Mark, Andy, Kurt, Paul, Gael, Jean, Toby, Laurent, Eric, Marie, Mabel, Susan, Scott, Alain, Carol, Norma, Elena, Helge, Marvin, Erna, and Laurenz