Taken From https://en.wikipedia.org/wiki/List_of_most_common_surnames_in_South_America
Almeida
Alves
Araújo
Azevedo
Barbosa
Cardoso
Carvalho
Cavalcante or Cavalcanti
Correia, Correa
Costa
Dias
Fernandes
Ferreira
Gomes
Gonçalves
Lima
Martins
Melo
Montes
Morais
Oliveira
Pereira
Ribeiro
Rocha
Rodrigues
Santos
Schmitz or Schmidt
Silva
Sousa
Teixeira