Surname D'Alonzo (D'Alonzo 
) , in the entire world, is quite a rare cognomen. The cognomen D'Alonzo is characteristic of Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Canada. Measured by absolute frequency, the name is most common in Italy, Argentina, and the United States. Much less frequently, D'Alonzo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| D'Alonzo | Italy, Canada, Argentina, United States, Germany |
| constance anthony d'alonzo (b. 1912) |
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| pete d'alonzo American gridiron football player (1929-2001), US (b. 1929) |
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| antonio d'alonzo Italian cyclist, IT (b. 1955) |
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| nicholas j d'alonzo researcher |
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| karen therese d'alonzo researcher (ORCID 0000-0002-3912-7442) |
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| daniele d'alonzo researcher |
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| marta d'alonzo researcher (ORCID 0000-0001-9153-8399) |
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| filippo d'alonzo |
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