Cognomen Onilio (Onilio 
) , in all the world, is a very rare last name. The family name Onilio is habitual in Latin America and the Caribbean, particularly Brazil, where it is an extremely rare surname, Venezuela, and Mexico. Much more frequently, Onilio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onilio | Italy, Mexico, United States, Brazil, Venezuela |
Cruz, Rigoni, Lisboa, Junior, Novais, Vieira, Martins, Santana, Almeida, Pereira, Ribeiro, Freitas, Fonseca, Medeiros, Sobrinho, Teixeira, Nogueira, Ferreira, Oliveira, Magalhaes, Rodrigues, Hernandez, Campos, Araujo, Soares, Santos, Reis, Dias, Lima, Neto, Silva, Sousa, Souza, Alves, Anaya, Costa, Fernandes, Paula, Pires, Rocha, Gomes, Lirio, Jesus, Neves, Faria, Filho, Macedo, Moraes, Pinto, and Nascimento