In all the world, Zirko (Zirko 
, Зирко 
) is an extremely rare boy's first name. Much more frequently, Zirko is the last name as well as the forename.
Mr, Andrej, Celena, Pamela, Robert, Ronald, Davide, Gladis, Larisa, Sandra, Javier, Jesica, Julian, Cassidy, Darlene, Dominic, Eleanor, Margaret, Cristian, Joshua, Helen, Tracy, James, Ms, Jim, Anna, Kyle, John, Olga, Milan, Mirta, Susan, Anita, Carol, Barry, Brian, Karen, Kevin, Pablo, Peppe, Ruben, David, Kristine, and Bernadette