In the entire world, Giannantonio (Giannantonio 
) is quite a rare masculine first name. The given name Giannantonio is habitual in Southern Europe, particularly Italy, where it is quite a rare boy's name. Also, Giannantonio is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Giannantonio | Italy, United States, Argentina, Canada, France |
| giannantonio romanelli author (15th century) (b. 1401) |
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| giannantonio valtrini IT (b. 1556) |
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| giannantonio orsini IT (b. 1569) |
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| giannantonio rocca Italian mathematician (1607-1656), IT (b. 1607) |
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giannantonio moschini Italian art historian (1773-1840), IT (b. 1773) |
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| giannantonio gabriel (b. 1722) |
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| giannantonio boni (1772-1832), IT (b. 1772) |
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giannantonio sperotto Italian footballer, IT (b. 1950) |
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| giannantonio menin author (20th century) (b. 1901) |
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| giannantonio manci Italian entrepreneur, IT (b. 1901) |
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giannantonio de vincenzo Italian saxophonist, IT (b. 1954) |
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| giannantonio pezzoli engineer (1927-2019), IT (b. 1927) |
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| giannantonio prinetti castelletti IT (b. 1922) |
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| giannantonio paladini Italian historian, IT (b. 1937) |
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| giannantonio castruccio Roman Catholic bishop |
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