Family name Tiago (Tiago 
, تياغو 
, チアゴ 
, among others...) , worldwide, is a common cognomen. The family name Tiago is characteristic of Portugal, where it is quite a common surname, Angola, and Luxembourg, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Brazil, Angola, and Portugal. More prevalently, Tiago is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tiago | Portugal, Angola, Philippines, Brazil, Mozambique |
| تياغو | Iraq, Sudan |
| チアゴ | Japan |
| Тьяго, Тиаго | Russia |
| טיאגו | Israel |
Chaime, Diego, Diogo, Fritaa, Jacob, Jaime, Jaume, Jákob, Merdaa, Santiago, Santjago, Thiago, Tiágo, Tíago, Tíágó, Tíágô, Tïago, Ya'Acov, Ya'Aqov, Yaacov, Yaakov, Yaaqov, Ťĩáğő, Диего, Диого, Дієго, Жауме, Сантьяго, Тяго, Тіаго, Хайме, Яков, דייגו, יעקב, סנטיאגו, תיאגו, تياجو, دييغو, سانتياغو, ジェイミー, ディエゴ, 吉米, 夏哥, 夏戈, 海梅, 迪翁, and 迭戈
| jerome de são tiago Roman Catholic clergyman (b. 1645) |
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| francisco de são tiago Roman Catholic bishop, PT (b. 1692) |
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| joaquim antônio de são tiago Brazilian journalist, teacher, dramatist, politician, BR (b. 1857) |
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henrique n'zita tiago Angolan revolutionary, AO (b. 1927) |
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| arnaldo claro são tiago Brazilian politician (1886-1979), BR (b. 1886) |
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| severo tiago footballer, PT (b. 1903) |
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| servais tiago Portuguese filmmaker (1925-2018), PT (b. 1925) |
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miguel tiago Portuguese politician, PT (b. 1979) |
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tiago apolónia Portuguese table tennis player, PT (b. 1986) |
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celso josé tiago BR |
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miguel tiago silva PT (b. 1998) |
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| jacksen tiago Brazilian footballer and manager, BR (b. 1968) |
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| ernando tiago Brazilian actor, BR |
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| armindo tiago Doctor, MZ |
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| patrícia v. tiago researcher |
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Melo, Borges, Vieira, Martins, Marques, Machado, Moreira, Santana, Almeida, Andrade, Cardoso, Barbosa, Batista, Pereira, Ribeiro, Freitas, Carvalho, Teixeira, Ferreira, Oliveira, Rodrigues, Goncalves, Castro, Araujo, Soares, Santos, Cruz, Rosa, Reis, Dias, Lima, Moura, Silva, Sousa, Souza, Alves, Fernandes, Costa, Brito, Pinto, Ramos, Rocha, Gomes, Lopes, Jesus, Nunes, Moraes, Mendes, Cunha, and Nascimento