Family name Piazzi (Piazzi 
) , worldwide, is quite a rare last name. The last name Piazzi is habitual in Italy, where it is quite a rare surname, Switzerland, where it is a rare surname, and Argentina. Measured by absolute frequency, it most frequently occurs in Italy, Brazil, and Argentina. Much less frequently, Piazzi is the forename as well as the last name.
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| Piazzi | Brazil, Italy, France, United States, Argentina |
| mauro piazzi (b. 1637) |
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giuseppe piazzi Italian Catholic priest of the Theatine order, mathematician, and astronomer (1746-1826), IT (b. 1746) |
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giuseppe piazzi Catholic bishop, IT (b. 1907) |
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| alfredo piazzi Italian educationist (1865-1922), IT (b. 1865) |
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| ugo piazzi Italian politician, IT (b. 1912) |
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| alberto piazzi (b. 1924) |
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| giuliano piazzi IT (b. 1934) |
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| roberta piazzi Italian singer, IT (b. 1951) |
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| pierluigi piazzi IT (b. 1943) |
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| giuseppe piazzi (b. 1950) |
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| daniele piazzi IT (b. 1958) |
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| lisa piazzi Italian latinist, IT (b. 1980) |
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| angela piazzi researcher |
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| manuela piazzi researcher |
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| jacopo piazzi researcher |
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