Cognomen Cainã (Cainã 
) , globally, is an extremely rare family name. The cognomen Cainã is habitual in Latin America and the Caribbean, particularly Brazil, where it is an extremely rare surname. More prevalently, Cainã is the forename as well as the last name.
Ito, Moreira, Menezes, Almeida, Andrade, Araújo, Cardoso, Caetano, Bezerra, Pereira, Ribeiro, Horacio, Freitas, Teixeira, Henrique, Ferreira, Oliveira, Zampieri, Margarida, Rodrigues, Fernandes, Gonçalves, Martins, Vieira, Guedes, Rangel, Dias, Lael, Lima, Mello, Silva, Souza, Soder, Alves, Costa, Ramos, Nascimento, Rossi, Gomez, Gomes, Godoy, Lopes, Nunes, Maturo, Morais, Moraes, Santos, Soares, Rocha, and Figueiredo