Cognomen Gaia (Gaia 
, ガイア 
, Гайя 
) , across the world, is a common surname. The surname Gaia is habitual in Brazil, where it is quite a rare surname, Italy, and Portugal. In absolute terms, this name is the most popular in Brazil, Italy, and India. Also, Gaia is the forename as well as the last name.
| annia gaia Daughter of Caius Annius Anullinus (b. 247) |
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| antônio alexandrino gaia BR (b. 1884) |
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| giovanni gaia Italian association football player (1900-1956), IT (b. 1900) |
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tiziano gaia Italian writer, IT (b. 1975) |
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| thea gaia Australian religious minister, AU (b. 1931) |
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| pio gaia (b. 1922) |
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alessandro gaia volleyball player, IT (b. 1997) |
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| robert gaia French politician, FR (b. 1949) |
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| valentina gaia Italian actress, IT (b. 1977) |
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| joão de gaia Portuguese poet, PT |
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| silvia gaia researcher |
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| ezio gaia researcher |
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| joana gaia researcher ORCID ID = 0000-0003-4243-3835 |
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| diego felipe gaia researcher |
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| darcy pedroso machado gaia Brazilian Esperantist, BR |
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