Surname Baia (Bay 
, Bahiya 
, Baia ) , globally, is a widespread family name. The last name Baia is characteristic of Denmark, where it is quite a common surname, Turkey, and Singapore (explore the name in all countries). Not in comparison with a country's population, it is commonest in Brazil, Turkey, and Indonesia. Very seldom, Baia is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bay | Myanmar, Brazil, Indonesia, United States, Turkey |
| Bahiya | Brazil, Indonesia, United States, India, Algeria |
| Baia | Myanmar, Brazil, Indonesia, United States, India |
| بايا | Iran, Morocco, Sudan |
| antonio de freitas baia Brazilian priest, BR (b. 1965) |
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| baia adel (b. 1964) |
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| odair baia São Toméan athletics competitor, ST (b. 1978) |
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| lucian baia researcher |
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| monica baia researcher |
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| pietro de baia bishop of the Roman Catholic Church |
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| margarida baia Ph.D. Carnegie Mellon University 2005 |
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| ianny watuzy monteiro baia researcher |
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| juliana c p baia researcher |
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| baia fernández de la torre Spanish writer, ES (b. 1980) |
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| famulby sousa baia association football player, ST (b. 1992) |
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| baia pataraia (b. 1982) |
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