Globally, Festen (Festen 
) is an extremely rare unknown gender first name. Much more prevalently, Festen is the last name as well as the forename.
Mr, Carol, Betty, Brian, Karen, Peter, David, Laura, Louis, Logue, Symon, Lydia, Jelle, Julia, Nancy, Nikki, Edwin, Edsel, Henny, Helma, Frank, Joost, Stijn, Steve, Susan, Rob, Luc, Jan, J M, Mark, Mike, Alex, Anke, Ajay, Bart, Paul, Riet, Lana, Jack, Jaap, Theo, Nike, Hans, Ilse, Marie, Marco, Frans, and Felix