Worldwide, Giancarlos (Giancarlos 
) is quite a rare boy's first name. The first name Giancarlos is habitual in Latin America and the Caribbean, particularly Peru, where it is quite a rare masculine name, Costa Rica, and the Dominican Republic. In absolute terms, it most frequently occurs in Latin America and the Caribbean, particularly Peru, Brazil, and Costa Rica. Much less frequently, Giancarlos is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Giancarlos | Brazil, Costa Rica, Peru, Dominican Republic, Venezuela |
| giancarlos conde cardona researcher (ORCID 0000-0001-8388-8874) |
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| giancarlos troncoso parady researcher (ORCID 0000-0002-7581-774X) |
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| giancarlos terreros Ecuadorian association football player (1998-), EC (b. 1998) |
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| giancarlos ochoa Bolivian footballer |
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Cruz, Sanchez, Salazar, Alvarez, Cordova, Pacheco, Pereira, Ramirez, Guevara, Martinez, Sandoval, Alvarado, Castillo, Guerrero, Gonzalez, Gonzales, Espinoza, Oliveira, Rodriguez, Rodrigues, Gutierrez, Hernandez, Mendoza, Morales, Quispe, Flores, Rios, Diaz, Lima, Silva, Souza, Perez, Ramos, Rojas, Reyes, Gomez, Fernandez, Lopez, Moreno, Santos, Araujo, Chavez, Castro, Campos, Rivera, Garcia, Torres, Vargas, Ortiz, and Villanueva