Family name Ridolfo (Ridolfo 
) , across the world, is quite a rare cognomen. The surname Ridolfo is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Switzerland. Not in comparison with a country's population, it most frequently occurs in Italy, Argentina, and the United States. Very seldom, Ridolfo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ridolfo | Brazil, Italy, Argentina, United States, France |
| ridolfo colonna (b. 850) |
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| ridolfo nigelli cardinal, IT (b. 1110) |
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ridolfo del ghirlandaio Italian painter (1483-1561), FR (b. 1483) |
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| ridolfo arlotti Italian poet (b. 1546) |
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| ridolfo castravilla Italian literary (16th century) (b. 1550) |
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| ridolfo sirigatti Italian sculptor and painter (1553-1608), FR (b. 1553) |
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| ridolfo campeggi Italian writer, poet and playwright, IT (b. 1565) |
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| ridolfo manzoni (b. 1675) |
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| ridolfo brignole sale (1784-1832), IT (b. 1784) |
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| ridolfo castinelli Italian engineer and politician, IT (b. 1791) |
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ridolfo livi Italian anthropologist (1856-1920), IT (b. 1856) |
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| ridolfo mazzucconi Italian journalist and writer, IT (b. 1889) |
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| r. ridolfo author (20th century) (b. 1901) |
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ridolfo capo ferro Italian fencer, IT |
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| claudio ridolfo Italian actor, IT (b. 1957) |
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