Surname D'Addario (D'Addario 
) , around the globe, is quite a rare cognomen. The cognomen D'Addario is habitual in Southern Europe, particularly San Marino, where it is quite a common surname, Italy, where it is quite a rare surname, and Albania. Measured by absolute frequency, it is commonest in Italy, Argentina, and the United States. Very seldom, D'Addario is the forename as well as the last name.
| VARIANT | COUNTRY |
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| D'Addario | Italy, United States, Argentina, Canada, France |
| raffaele d'addario Italian economist (1899-1974), IT (b. 1899) |
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vincenzo d'addario IT (b. 1942) |
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| arnaldo d'addario Italian archivist and historian, IT (b. 1922) |
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gary d'addario American actor, US |
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| amedeo d'addario Italian politician, IT (b. 1941) |
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| salvatore d'addario (b. 1950) |
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| patrizia d'addario (b. 1967) |
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| marco d'addario researcher (ORCID 0000-0002-7659-885X) |
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| vincenzo d'addario researcher |
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| claudio d'addario researcher |
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| brian d'addario |
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| michael d'addario |
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| alessandro d'addario association football player, SM (b. 1997) |
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| michael hall d'addario American actor, US (b. 1997) |
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