Cognomen Fontanini (Fontanini 
) , around the globe, is quite a rare surname. The last name Fontanini is characteristic of Italy, where it is quite a rare surname, Argentina, and Uruguay, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Italy, Argentina, and Brazil. Much less frequently, Fontanini is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fontanini | Brazil, Italy, France, United States, Argentina |
| benedetto fontanini Italian monk, FR (b. 1495) |
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| carlo fontanini Roman Catholic bishop (1766-1848) (b. 1766) |
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pietro fontanini Italian politician, IT (b. 1952) |
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fabricio fontanini Argentine footballer, AR (b. 1990) |
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| roberto fontanini Italian association football player, IT (b. 1962) |
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| gabriella fontanini researcher |
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| debora fontanini researcher |
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| alfredo fontanini researcher (ORCID 0000-0003-4561-9563) |
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| anthony fontanini researcher |
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| estefania fontanini Argentine canoeist, AR (b. 1988) |
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| jan baptysta fontanini |
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