Last name Casadio (Casadio 
) , in the entire world, is quite a common cognomen. The surname Casadio is habitual in San Marino, where it is quite a common surname, Italy, where it is quite a rare surname, and Argentina, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Italy, Brazil, and Argentina. Very seldom, Casadio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casadio | Philippines, Brazil, Italy, Argentina, France |
| stefano casadio Italian catholic priest, IT (b. 1913) |
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| tolmino casadio Italian association football player, IT (b. 1916) |
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| aglauco casadio Italian film director, screenwriter and author, IT (b. 1920) |
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| fabrizio casadio Italian television presenter, IT (b. 1935) |
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| gian paolo casadio (b. 1935) |
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| valerio casadio Italian hellenist (1948-), IT (b. 1948) |
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| giovanni casadio Italian historian of religion (1950-), IT (b. 1950) |
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| claudio casadio Italian politician (1956), IT (b. 1956) |
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| claudio casadio Italian stage actor (1958), IT (b. 1958) |
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| claudia casadio researcher |
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| r. casadio researcher ORCID ID = 0000-0002-1330-7787 |
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| melina casadio researcher |
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| paolo casadio researcher |
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| maura casadio researcher (ORCID 0000-0003-2338-8995) |
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| chiara casadio researcher |
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