Cognomen Guiol (Guiol 
) , all around the world, is a rare family name. The family name Guiol is habitual in France, where it is a rare surname, Switzerland, and Greece, where it is a very rare surname. In absolute terms, it is the most numerous in France, the United States, and Switzerland. Very seldom, Guiol is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guiol | Spain, Switzerland, France, United States, Germany |
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clara guiol American actress (1908-1995), US (b. 1908) |
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| fred guiol Film director; screenwriter (1898-1964), US (b. 1898) |
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| andré guiol French politician, FR (b. 1954) |
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| patrick guiol FR (b. 1947) |
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| hervé j. f. guiol Ph.D. Université de Provence - Aix-Marseille I 1995 |
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| daniela guiol Ph.D. Universidade de São Paulo 2001 |
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Mr, Raoul, Robin, Roger, Denis, Diana, Gregg, Laura, Lazlo, Louis, Johan, Julie, Najla, Herve, Henri, Henry, Heidi, Fanny, Marion, Maryse, Maliya, Magali, Brice, Boris, Cyril, Clara, Ms, Sã, Bhe, Luc, Marc, Mary, Anne, Clã, Paul, Gene, Michel, Greg, Leon, Joan, Jean, Eric, Yves, Marie, Simon, Alain, Andre, Annie, Gwen, and Myriam