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Across the world, Marcilio (Marcilio
, Marcílio
) is a common boy's first name. The first name Marcilio is habitual in Brazil, where it is quite a common boy's name, Portugal, where it is a rare boy's name, and Peru, where it is a very rare boy's name. Measured by absolute frequency, it is commonest in Brazil, Mexico, and Portugal. Much less frequently, Marcilio is the last name as well as the forename.
Melo, Junior, Vieira, Martins, Marques, Machado, Moreira, Santana, Almeida, Andrade, Cardoso, Barbosa, Batista, Pereira, Ribeiro, Freitas, Carvalho, Teixeira, Ferreira, Oliveira, Rodrigues, Goncalves, Barros, Campos, Araujo, Soares, Cruz, Reis, Dias, Lima, Neto, Moura, Silva, Sousa, Souza, Alves, Fernandes, Costa, Brito, Pinto, Ramos, Rocha, Gomes, Lopes, Jesus, Filho, Moraes, Santos, Cunha, and Nascimento