Family name Tadeu (Tadeu 
, Thaddaeus 
) , around the world, is quite a common cognomen. The last name Tadeu is habitual in Portugal, where it is quite a rare surname, Angola, and Mozambique. Not in comparison with a country's population, the name is most common in Brazil, Angola, and Nigeria. More prevalently, Tadeu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tadeu | Portugal, Angola, United States, Brazil, Mozambique |
| Thaddaeus | Germany, Kenya, Nigeria, United States, Brazil |
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sandra tadeu BR (b. 1956) |
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paulo tadeu Brazilian politician, BR (b. 1967) |
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eugénio tadeu BR (b. 1965) |
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hermes tadeu BR (b. 1978) |
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| sólon tadeu BR (b. 1948) |
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| regis tadeu Brazilian journalist, BR (b. 1960) |
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| pedro tadeu Portuguese journalist, PT (b. 1963) |
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| tânia tadeu person identified in the Museu da Pessoa collection, BR (b. 1966) |
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| sandra tadeu Brazilian politician |
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| pedro tadeu researcher |
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| ana carolina reis tadeu researcher |
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| a. tadeu researcher |
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| pedro josé arrifano tadeu Ph.D. Universidade de Trás-os-Montes e Alto Douro 2011 |
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| jorge manuel guerra tadeu PT |
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Melo, Barros, Junior, Vieira, Martins, Machado, Moreira, Santana, Almeida, Andrade, Cardoso, Barbosa, Pereira, Ribeiro, Freitas, Carvalho, Pinheiro, Teixeira, Ferreira, Oliveira, Rodrigues, Goncalves, Campos, Castro, Araujo, Soares, Cruz, Rosa, Reis, Dias, Lima, Neto, Silva, Sousa, Souza, Alves, Fernandes, Costa, Ramos, Rocha, Gomes, Leite, Lopes, Jesus, Nunes, Filho, Moraes, Santos, Pinto, and Nascimento