Globally, Kjellsen (Kjellsen 
) is an extremely rare unknown gender given name. Much more prevalently, Kjellsen is the last name as well as the forename.
Mr, Joan, Judy, Jill, Todd, Teri, Tina, Norm, Hans, Marla, Maren, Sandy, Sarah, Shari, Simon, Susan, Cathy, Becky, Britt, Bryan, Karen, Kerry, John, Lisa, Leon, Laci, Ms, Pã, Ron, Dan, Jon, Jim, Eli, Mayo, Alex, Arne, Kevin, Asle, Knut, Pål, Rune, Dana, Dale, Dada, Drew, Geir, Greg, Lane, Cody, and Kjell