Across the world, Onilia (Onilia 
) is quite a rare feminine first name. The first name Onilia is characteristic of Latin America and the Caribbean, particularly Brazil, where it is a rare girly name. Very seldom, Onilia is the last name as well as the forename.
Melo, Duarte, Vieira, Martins, Machado, Santana, Almeida, Andrade, Barbosa, Batista, Pereira, Ribeiro, Freitas, Silveira, Carvalho, Teixeira, Ferreira, Oliveira, Conceicao, Rodrigues, Guimaraes, Goncalves, Borges, Castro, Amorim, Araujo, Cruz, Rosa, Reis, Dias, Lima, Meira, Silva, Sousa, Souza, Alves, Fernandes, Costa, Paiva, Pinto, Pires, Rocha, Gomes, Jesus, Nunes, Mendes, Santos, Soares, Paula, and Nascimento