Cognomen De Gennaro (De Gennaro 
) , around the globe, is quite a common surname. The last name De Gennaro is habitual in Italy, where it is quite a rare surname, Argentina, and Venezuela, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Italy, Argentina, and the United States.
| VARIANT | COUNTRY |
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| De Gennaro | Italy, France, United States, Argentina, Venezuela |
| domenico de gennaro Italian economist (1730-1803), IT (b. 1720) |
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| emilio de gennaro Italian politician (1855-1911), IT (b. 1855) |
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| gaetano de gennaro Brazilian painter (1890-1959), BR (b. 1890) |
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gianni de gennaro police officer, IT (b. 1948) |
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luca de gennaro Italian disc jockey, IT (b. 1959) |
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| giovanni de gennaro IT (b. 1923) |
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giovanni de gennaro Italian canoeist, IT (b. 1992) |
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| luigi de gennaro Italian psychologist (1959-), IT (b. 1959) |
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| camillo de gennaro Roman Catholic bishop |
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| davide de gennaro Italian economist, IT (b. 1989) |
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