Last name Piancastelli (Piancastelli 
) , throughout the world, is quite a rare family name. The surname Piancastelli is characteristic of Italy, where it is quite a rare surname, Switzerland, where it is a rare surname, and France, where it is a very rare surname. Measured by absolute frequency, it is commonest in Italy, Brazil, and France. Much less frequently, Piancastelli is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Piancastelli | Italy, Switzerland, United States, France, Brazil |
| giovanni piancastelli Italian painter (1845-1926), IT (b. 1845) |
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| carlo piancastelli IT (b. 1867) |
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| marcio piancastelli automobile designer (b. 1936) |
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| mariangela piancastelli Italian basketball player (1953-), IT (b. 1953) |
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| vittoria piancastelli Italian actress (1962-2015), IT (b. 1962) |
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| maria novella piancastelli researcher (ORCID 0000-0003-3303-7494) |
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| ugo piancastelli |
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| tathi piancastelli |
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| erika piancastelli Italian–American softball player, IT (b. 1996) |
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Mr, Mirko, Mirco, Sofia, Alice, Alain, Andre, Angie, Artur, Aurea, Carlo, Carla, Bento, Bruno, Paula, Paola, Paolo, Piero, Robin, Roque, Rubia, Delio, Mabel, Genny, Maura, Marly, Ms, Ana, Sara, Alba, Anna, Pier, Lino, Lisa, Luca, Luiz, John, Tony, Eder, Edna, Eric, Enzo, Emma, Ezio, Maria, Mario, Marco, Mauro, and Gemma