Last name Guastavino (Guastavino 
) , all over the world, is quite a rare family name. The cognomen Guastavino is habitual in Argentina, where it is quite a rare surname, Uruguay, and Italy, where it is a rare surname. Measured by absolute frequency, the name is most common in Argentina, Italy, and France.
| VARIANT | COUNTRY |
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| Guastavino | France, Argentina, Italy, Brazil, United States |
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rafael guastavino moreno Spanish architect, ES (b. 1842) |
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| josé miguel guastavino Argentinian politician, judge and lawyer, AR (b. 1838) |
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| antonio guastavino (b. 1837) |
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| clemente pujol de guastavino Spanish painter, ES (b. 1850) |
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carlos guastavino Argentine composer, AR (b. 1912) |
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| pietro guastavino IT (b. 1858) |
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| rafael guastavino American builder, 1872-1950, ES (b. 1872) |
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luis guastavino Chilean politician, CL (b. 1931) |
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| jean-marie guastavino French politician (1886-1960), FR (b. 1886) |
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pedro guillermo ángel guastavino Argentinian politician, AR (b. 1954) |
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| bernardo guastavino Argentinian association football player, AR (b. 1929) |
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| elias p. s. guastavino Argentinian judge (1930-1999), AR (b. 1930) |
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diego guastavino Uruguayan footballer, UY (b. 1984) |
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| pierre-marie guastavino French lawyer, essayist and politician, FR (b. 1946) |
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| julio guastavino UY (b. 1952) |
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Mr, Aida, Aixa, Carl, Cala, Paul, Raul, Rosa, Rene, Resa, Abel, Rita, Dora, Gary, Gabs, Greg, Lara, Leah, Leda, Liza, Lori, Dina, Anne, Anna, Aldo, Mia, Ale, Ana, Amy, Rut, Leo, Luc, Luu, Ema, Ebe, Marc, Mary, Mark, Manu, Mica, Sara, Saul, Susy, Stã, Alex, Alan, Lola, and Lucy