Last name Giambruno (Giambruno 
) , across the world, is quite a rare cognomen. The cognomen Giambruno is characteristic of Uruguay, where it is quite a rare surname, Italy, and Argentina, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Italy, the United States, and Argentina. Much less frequently, Giambruno is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Giambruno | Uruguay, Italy, Chile, United States, Argentina |
| nicola giambruno IT (b. 1839) |
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| cyro giambruno Uruguayan politician (1898-1980), UY (b. 1898) |
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| salvatore giambruno author (20th century) (b. 1901) |
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| luigi giambruno Italian association football player, IT (b. 1918) |
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| cyro giambruno Uruguayan writer (1926-1962), UY (b. 1926) |
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| antonio giambruno Italian mathematician (1949-), IT (b. 1949) |
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| juan giambruno Uruguayan cardiac surgeon, UY (b. 1950) |
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| mark giambruno American animator, US (b. 1957) |
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| mario álvarez giambruno Uruguayan politician, UY (b. 1958) |
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| vincenzo giambruno researcher |
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| roberto giambruno researcher (ORCID 0000-0002-4566-261X) |
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| marco giambruno Italian footballer, IT (b. 1984) |
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