Surname Piazza (Piazza 
, Piad 
, Pizer 
) , all around the world, is a common family name. The last name Piazza is characteristic of Italy, where it is quite a common surname, Argentina, where it is quite a rare surname, and Switzerland. In absolute terms, it most frequently occurs in Italy, the United States, and Argentina. Much less frequently, Piazza is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Piazza | Argentina, Brazil, France, Italy, United States |
| Piad | Philippines, United Kingdom, Canada, Spain, United States |
| Pizer | United Kingdom, Canada, Australia, Brazil, United States |
| Piatza | United States, Germany |
| michel de piazza (b. 1250) |
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| alberto piazza Italian painter (1490-1528), IT (b. 1490) |
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| callisto piazza Italian painter (1500-1561), IT (b. 1500) |
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| dafne di piazza (b. 1550) |
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| paolo piazza Italian painter (1560-1620), IT (b. 1560) |
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| camillo piazza Roman Catholic bishop (b. 1612) |
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giulio piazza Italian cardinal (1663-1726), IT (b. 1663) |
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| carlo bartolomeo piazza (b. 1632) |
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| vincenzo piazza Italian writer and musician (1668-1745) (b. 1668) |
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| ambrosio piazza Italian architect and sculptor, IT (b. 1701) |
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| francesco piazza Italian Roman Catholic bishop, IT (b. 1707) |
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| antonio piazza Italian journalist, playwright, novelist and librettist, IT (b. 1742) |
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pietro axerio piazza Italian entrepreneur and poet, IT (b. 1827) |
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| gaetano dalla piazza (b. 1768) |
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| antonio piazza journalist, librettist and poet (1795-1872), IT (b. 1795) |
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