All over the world, Castaner (Castaner 
) is an extremely rare male forename. Much more frequently, Castaner is the last name as well as the forename.
Mr, Elba, Eric, Fred, Ines, Iris, Ilsa, Ivan, Omar, Owen, Maria, Marie, Manon, Monse, Sarah, Serge, Sonia, Steve, Stela, Scott, Alain, Angel, Noel, Juan, Jean, John, Ms, Ana, Ron, Noe, Eli, Eva, Marc, Mary, Anna, Anne, Annie, Aida, Paco, Ruth, Lani, Lily, Lola, Luis, Léa, Jane, Jade, Jose, Cara, and Ambre