Family name Giannantonio (Giannantonio 
) , in the entire world, is quite a rare last name. The cognomen Giannantonio is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Uruguay. Measured by absolute frequency, it is the most numerous in Italy, the United States, and Argentina. Likewise, Giannantonio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giannantonio | Italy, United States, Argentina, Canada, France |
| ettore giannantonio Italian politician, IT (b. 1889) |
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| john giannantonio American-football player (1930-), US (b. 1930) |
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| pompeo giannantonio IT (b. 1923) |
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| raffaele giannantonio IT (b. 1957) |
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| valeria giannantonio (b. 1960) |
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| diego giannantonio Argentinian rugby union player, AR (b. 1973) |
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| tommaso giannantonio researcher, ORCID id # 0000-0002-9865-0436 |
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| sara giannantonio researcher |
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| franco di giannantonio IT |
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| nino di giannantonio chess player (b. 1997) |
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