Globally, Jonasen (Jonasen 
) is a very rare mostly male, but seldom girly first name. The first name Jonasen is characteristic of Philippines, where it is a very rare unisex name, and India, where it is an extremely rare predominantly male, but very seldom girly name. More prevalently, Jonasen is the last name as well as the forename.
Mr, Lise, Jana, Jack, Jake, John, Jorn, Jeff, Thor, Tina, Nina, Nels, Neil, Erik, Emil, Fred, Maria, Marie, Mette, Megan, Sarah, Simon, Dean, Signe, Rose, Aage, Ms, Mae, Max, Ann, Amy, Bob, Kay, Kaj, Kim, Lea, Jay, Jon, Joe, Jim, Mary, Matt, Mike, Sara, Stig, Anna, Anne, Brit, and Aaron