Cognomen Lais (Lai 
, Lais 
, Лаиса 
) , throughout the world, is a widespread family name. The cognomen Lais is habitual in Hong Kong, where it is a prevalent surname, Macao, where it is a widespread surname, and Bermuda (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in China, Malaysia, and Hong Kong. Much less frequently, Lais is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lai | Malaysia, China, Hong Kong, Brazil, Taiwan |
| Lais | Malaysia, China, Italy, United States, Brazil |
| Лаиса | Russia, Kazakhstan |
| Лаис | Russia, Kyrgyzstan, Kazakhstan |
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erik fleming af lais (b. 1616) |
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| giuseppe lais Italian astronomer (1845-1921), IT (b. 1845) |
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| bernhard lais Estonian photographer, SE (b. 1854) |
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detlev lais German saxophonist, DE (b. 1911) |
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| alberto lais Italian admiral, IT (b. 1882) |
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| eduard lais German politician (1893-1974), DE (b. 1893) |
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| robert lais (b. 1886) |
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| otto lais German painter (1897-1988), DE (b. 1897) |
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| hermann lais German priest, DE (b. 1912) |
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christian lais German singer, DE (b. 1963) |
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| rudolf lais (b. 1904) |
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marc lais German footballer, DE (b. 1991) |
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| klaus-jürgen lais German politician, DE (b. 1944) |
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| ruedi lais Swiss politician, CH (b. 1953) |
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| axel lais (b. 1964) |
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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, Barros, Campos, Castro, Araujo, Cruz, Rosa, Reis, Dias, Lima, Silva, Sousa, Souza, Alves, Costa, Fernandes, Brito, Ramos, Rocha, Gomes, Lopes, Jesus, Nunes, Moraes, Mendes, Santos, Soares, Pinto, and Nascimento