Last name Giannattasio (Giannattasio 
) , in the entire world, is quite a common surname. The last name Giannattasio is habitual in Italy, where it is quite a rare surname, Argentina, and Switzerland, where it is a rare surname. Not in comparison with a country's population, it is commonest in Italy, Argentina, and the United States. Much less frequently, Giannattasio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giannattasio | Argentina, Brazil, France, Italy, United States |
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francesco giannattasio Italian politician (1863-1932), IT (b. 1863) |
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| nicola giannattasio Roman Catholic archbishop (b. 1871) |
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| ugo giannattasio Italian painter (1888-1958), IT (b. 1888) |
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| uga giannattasio Italian artist (b. 1888) |
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pasquale giannattasio Italian sprinter, IT (b. 1941) |
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| pietro giannattasio Italian politician and officer, IT (b. 1931) |
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| diego giannattasio Italian association football player, IT (b. 1945) |
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| bianca maria giannattasio Italian archaeologist (1948-), IT (b. 1948) |
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| francesco giannattasio (b. 1950) |
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| carmen giannattasio Italian opera singer, IT (b. 1975) |
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| robert b. giannattasio botanist |
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| rosa giannattasio andria Italian hellenist, IT |
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| antonietta giannattasio researcher (ORCID 0000-0001-8073-7114) |
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| sergio giannattasio researcher |
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| nicola giannattasio Italian association football player and journalist, IT (b. 1980) |
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