Surname Piaz (Piaz 
) , in the world, is quite a rare last name. The cognomen Piaz is characteristic of Switzerland, where it is quite a rare surname, Uruguay, where it is a rare surname, and Brazil. Not in comparison with a country's population, this name is the most popular in Brazil, Italy, and Switzerland. Much less frequently, Piaz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Piaz | Switzerland, Italy, Brazil, United States, Argentina |
| giovan battista del piaz (b. 1683) |
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john dal piaz French compagnie générale transatlantique, FR (b. 1865) |
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tita piaz Italian mountaineer and mountain guide, IT (b. 1879) |
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gianna piaz Italian actress, IT (b. 1923) |
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| teddy piaz French photographer (b. 1899) |
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| giambattista dal piaz Italian geologist and scientist, IT (b. 1904) |
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| giorgio vittorio dal piaz Italian geologist, IT (b. 1935) |
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| ezequiel piaz Brazilian musician, BR (b. 1967) |
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| alexandre josé piaz Brazilian politician, BR (b. 1971) |
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Mr, Raul, Rosa, Rene, Davi, Geni, Gema, Gean, Lais, Luci, Luca, Luis, Luiz, Luan, Jair, Jose, Josi, John, Joao, Joel, Jean, Nair, Rafa, Elma, Kaua, Anna, Ms, Ana, Ary, Bia, Rui, Leo, Lia, Joe, Joy, Noe, Eni, Flo, Ivo, Ida, Mari, Mary, Mike, Sara, Alex, Alan, Aldo, Adir, and Enio