Cognomen Ciarlo (Ciarlo 
) , in the world, is quite a rare last name. The cognomen Ciarlo is characteristic of Malta, where it is quite a common surname, Italy, where it is quite a rare surname, and Uruguay. In absolute terms, it most frequently occurs in Italy, Argentina, and the United States. Very seldom, Ciarlo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ciarlo | Brazil, Italy, Malta, United States, Argentina |
| joseph j. ciarlo American photographer (born 1859), US (b. 1859) |
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dino ciarlo IT (b. 1917) |
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gaston ciarlo Uruguayan singer, guitarist, and composer, UY (b. 1945) |
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| flora ciarlo politician, US (b. 1932) |
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| domenico ciarlo filologo classico italiano (1972-), IT (b. 1972) |
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| eleonora ciarlo researcher |
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| christie ciarlo researcher |
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| laura ciarlo researcher |
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| claudia ciarlo Italian association football player, IT (b. 1985) |
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