All around the world, Tjäder (Tjäder 
) is an extremely rare unknown gender given name. Much more prevalently, Tjäder is the last name as well as the forename.
Per, Marie, Malin, Anita, Claes, Karin, Klara, Peter, Robin, Linda, Johan, Jonas, Jenny, Jimmy, Taina, Tomas, Elisa, Fanny, Oskar, Wanda, Marita, Martin, Maria, Åsa, Hans, Ebba, Pia, Lex, Jan, Ida, Ulf, Mats, Sara, Anna, Arne, Adam, Magnus, Rolf, Lina, Tomi, Tove, Tina, Nils, Nina, Elin, Erik, Emil, Emma, Lena, and Monica