Across the world, Castelo Branco (Castelo Branco 
) is an extremely rare unknown gender first name. Much more frequently, Castelo Branco is the last name as well as the forename.
Ana, Luis, Jane, Jose, Joao, Juan, Neto, Nuno, Elke, Vivi, Fran, Igor, Yago, Maria, Marta, Marco, Maiã, Milla, Suely, Sonia, Sofia, Aline, Lina, Leon, Lara, Gina, Ray, Ruy, Lay, Jan, Ely, Isa, Wal, Mari, Mara, Sara, Andre, Alex, Anne, Caio, Cris, Ciro, Beth, Kaio, Rose, Rita, Davi, Gabi, Alan, and Anita