All around the world, Gastao (Gastao 
) is quite a rare boy's first name. The first name Gastao is habitual in Guinea-Bissau, where it is quite a rare masculine name, Brazil, and Portugal. Very seldom, Gastao is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Gastao | Portugal, Brazil, Angola, Mozambique, Guinea-Bissau |
| gastao de saldanha da gama (born 1924) (b. 1924) |
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| gastao manuel henrique Brazilian sculptor, born 1933, BR (b. 1933) |
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| gastao entrudo Portuguese bodyboarder, PT (b. 1953) |
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| gastao de araujo leite politician from Brazil, BR (b. 1954) |
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| gastao braga Ph.D. New York University 1989 |
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| gastao cruz researcher (ORCID 0000-0002-7397-9104) |
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| gastao krein high energy physicist |
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| gastao villeroy |
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