Cognomen Guido (Guido 
, 吉多 
, Гуидо 
, and others...) , in the world, is a common surname. The surname Guido is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a common surname, Costa Rica, where it is quite a common surname, and El Salvador (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Nicaragua, Italy, and Mexico. More frequently, Guido is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guido | Germany, Italy, Brazil, Nicaragua, Argentina |
| 吉多 | China |
| Гуидо, Гидо | Russia |
| גידו | Israel |
| Гвидо | Russia, Estonia |
| palmerino di guido Italian active around 1300– F:0, IT (b. 1250) |
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| bernardus guido (b. 1265) |
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| bartolomeo di domenico di guido Italian artist (b. 1430) |
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| antonio di guido poet, IT (b. 1500) |
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| miguel sánchez de guido Costa Rican politician, CR (b. 1528) |
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| ferdinando guido, conte di porcia e brugnara DE (b. 1610) |
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| giovanni antonio guido Italian composer, IT (b. 1675) |
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tomás guido Argentine politician and diplomat (1788-1866), AR (b. 1788) |
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| giovanni domenico di guido Roman Catholic bishop (1777-1848) (b. 1777) |
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| rufino guido Argentinian military personnel, AR (b. 1796) |
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mario m. guido AR (b. 1884) |
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ángel guido Argentine architect, engineer and writer, AR (b. 1896) |
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josé maría guido President of Argentina, AR (b. 1910) |
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beatriz guido writer, AR (b. 1924) |
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| alfredo guido Argentinian painter (1892-1967), AR (b. 1892) |
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Ruiz, Morales, Müller, Sanchez, Schmidt, Schmitz, Alvarez, Bianchi, Pereira, Ramirez, La Vespa, Jimenez, Herrera, Ferrari, Martinez, Castillo, Gonzalez, Ferreira, Oliveira, Schneider, Rodriguez, Gutierrez, Quispe, Flores, Vargas, Torres, Diaz, Neto, Silva, Souza, Costa, Perez, Ramos, Rossi, Rojas, Guidi, Hernandez, Gomez, Filho, Weber, Mamani, Medina, Santos, Castro, Romero, Romano, Garcia, Junior, Lopez, and Fernandez