Worldwide, Izaias (Izaias 
) is a common masculine given name. The given name Izaias is characteristic of Brazil, where it is quite a common male name, Portugal, where it is a rare male name, and Nicaragua. Measured by absolute frequency, the name is most common in Brazil, Mexico, and Portugal. Much less frequently, Izaias is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Izaias | Spain, Brazil, United States, Mexico, Honduras |
| izaias alves ferreira Brazilian politician, BR (b. 1954) |
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| izaias régis neto politician from Brazil, BR (b. 1954) |
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| izaias jose de santana politician from Brazil, BR (b. 1966) |
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| izaias da silva lima neto researcher |
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| izaias brasil researcher (ORCID 0000-0002-6975-3460) |
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| izaias branco da silva colino politician from Brazil, BR (b. 1983) |
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Melo, Vieira, Martins, Machado, Moreira, Miranda, Santana, Almeida, Andrade, Cardoso, Barbosa, Batista, Bezerra, Pereira, Ribeiro, Freitas, Carvalho, Ferreira, Oliveira, Conceicao, Rodrigues, Goncalves, Junior, Barros, Araujo, Soares, Cruz, Reis, Dias, Lima, Neto, Moura, Silva, Sousa, Souza, Alves, Fernandes, Costa, Brito, Ramos, Rocha, Gomes, Lopes, Jesus, Nunes, Filho, Moraes, Santos, Cunha, and Nascimento