Globally, Sahlgren (Sahlgren 
) is an extremely rare unknown gender first name. Much more prevalently, Sahlgren is the last name as well as the forename.
Mr, Olof, Otto, Maria, Marie, Mikko, Sanna, Susan, Britt, Karen, Petra, Pekka, David, Linda, Lucas, Lynne, Johan, Julia, Elina, Erica, Hanna, Helen, Emma, Emil, Nils, Till, Ms, Bo, Mel, Pim, Jan, Ida, Mark, Maja, Mike, Sami, Vigge, Saku, Anna, Anne, Asko, Kent, Paul, Leif, Linn, John, Joan, Tine, Seda, and Felix