All over the world, Plessner (Plessner 
, פלסנר 
) is an extremely rare unknown gender forename. Much more prevalently, Plessner is the last name as well as the forename.
Mr, Dirk, Gary, Gail, Gene, Lisa, John, Joan, Jens, Neil, Eric, Erik, Fran, Fred, Wade, Mitch, Sarah, Susan, Scott, Allen, Angel, Amotz, Dale, Chris, Ryan, Rene, Ms, Ari, Amy, Dee, Dan, Jan, Jac, Ted, Von, Mary, Mark, Matt, Anna, Anne, Adam, Beth, Kent, Kimi, Kyle, Paul, Rolf, Rick, and Carol