Cognomen Gian Carlo (Gian Carlo 
) , around the world, is a rare last name. The family name Gian Carlo is characteristic of Chile, where it is a rare surname, Italy, where it is a very rare surname, and Portugal. Predominantly, Gian Carlo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gian Carlo | Costa Rica, Italy, Philippines, Chile, Peru |
Giancarlo, Giovanni Carlo, Jan Karol, Jean-Charles, Joan Carles, John Charles, João Carlos, Juan Carlos, Juan-Carlos, Джанкарло, Жан-Шарль, Хуан Карлос, and خوان كارلوس
Go, Sanchez, Salazar, Serrano, Soriano, Cabrera, Pascual, Delgado, De Leon, Navarro, Martinez, Santiago, Castillo, Bautista, Gonzales, Espiritu, Enriquez, Alcantara, Rodriguez, Dela Cruz, Gutierrez, Fernandez, Miranda, Mendoza, Mercado, Morales, Lim, Cruz, Diaz, Gini, Macam, Palma, Perez, Ramos, Rossi, Reyes, Concepcion, Lopez, Manuel, Santos, Aquino, Castro, Garcia, Torres, Flores, Isidro, Marquez, Magnani, Yabut, and Villanueva