Last name Alarcão (Alarcão 
) , all around the world, is a rare cognomen. The cognomen Alarcão is habitual in Portugal, where it is quite a rare surname, Brazil, where it is a very rare surname, and South Africa, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Alarcão | Portugal, United States, South Africa, Brazil |
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dom josé de barros alarcão Roman Catholic bishop, PT (b. 1634) |
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| joão de alarcão PT (b. 1854) |
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filipe alarcão Product designer, PT (b. 1963) |
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| eduardo alarcão Portuguese painter (1930-2003), PT (b. 1930) |
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| jorge de alarcão archaeologist, PT (b. 1934) |
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| vanderli barbosa alarcão person identified in the Museu da Pessoa collection, BR (b. 1955) |
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| jeferson da silva alarcão person identified in the Museu da Pessoa collection, BR (b. 1977) |
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| madalena alarcão researcher |
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| violeta alarcão researcher |
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| ana c alarcão researcher (ORCID 0000-0003-1786-8167) |
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| henrique de figueiredo e alarcão |
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Ana, Joyce, João, Tiago, Inês, Zilda, Marina, Marcos, Manuel, Miguel, Mário, Shaila, André, Amanda, Adenir, Carlos, Camila, Bianca, Rafael, Robson, Renata, Daniel, Joana, Jorge, José, Jaime, Zé, Suze, Caio, Luis, Luiz, Nuno, Igor, Maria, Marta, Sonia, Greyce, Alice, Andre, Bruno, Kelly, Paula, Paulo, Pedro, David, Diogo, Laura, Lilia, Alana, and Janine