Across the world, Glaessner (Glaessner 
) is an extremely rare unknown gender first name. Much more frequently, Glaessner is the last name as well as the forename.
Mr, Parker, Philip, Robert, Ronald, Thomas, Verina, Maxwell, Michael, Sabrina, Shirley, Abigail, Kathryn, Patrick, Gerardo, Ernesto, Valeria, Valerie, Brigitte, Kathleen, Patricia, Gert-Joachim, Cheryl, Andrew, Andres, Andrea, Ms, Max, Ned, Sian, Phil, Juan, Todd, Tina, Eric, Hans, Jennifer, Igor, Sonya, Cecil, Brian, Peter, David, Laura, Ellen, Emily, Wanda, Sophie, Maria, and Theodore