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Cognomen Irênio (Irênio ) , across the world, is an extremely rare last name. Much more frequently, Irênio is the forename as well as the last name.
Irenio
Maia, Silva, Sousa, Souza, Gomes, Filho, Aguiar, Junior, Júnior, Pimentel, Nascimento, and Lopes Coutinho