Family name Гуйдо (Guido 
, Guydo 
, Гуйдо 
) , in the world, is a common last name. The surname Гуйдо is habitual in 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). In absolute terms, it is the most numerous in Nicaragua, Italy, and Mexico. More frequently, Гуйдо is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guido | Germany, Argentina, Nicaragua, Italy, Brazil |
| Guydo | Brazil, United States, Peru, Mexico |
| Гуйдо | Ukraine, Kazakhstan, Belarus, Russia, Georgia |
| Gouido | United States |