Silveira is a "new christian" last name, probably of Portuguese origin. New christians were people of jewish ancestry who were forcibly converted to Christianity mostly in Portugal but in Spain and France as well.
Because New Christians were also forced to emigrate, many changed their last names to the names of trees or plants. This created a way to identify new christians of jewish origin in the New World. Therefore many adopted last names like Silveira which means forest, Oliveira (meaning the Olive tree), Pereira (meaning the Pear tree), Macieira (meaning the Apple tree),Larangeiras (meaning the Orange tree).
Sylvio Silveira's birth name is Sylvio Camboim Silveira.
Alexander Silveira's birth name is Sean Alexander Silveira Brun.
Mozael Silveira's birth name is Mozael Maciel da Silveira.
Silveira Sampaio's birth name is Jos da Silveira Sampaio.
Leonor Silveira's birth name is Leonor da Silveira Moreno de Lemos Gomes.
Silveirinha's birth name is Octvio da Silveira.
Alexandre Varella's birth name is Alexandre Varella Silveira.
Ronnie Silveira is 6' 4".
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Yara Lins's birth name is Oraslia Severina da Silveira.
Fabiano Moura's birth name is Fabiano D'Albuquerque Silveira Moura.
Alexander Silveira goes by Brun.