Surname Гайи (Gailly 
, Гайи 
) , globally, is a rare last name. The family name Гайи is characteristic of Belgium, where it is quite a rare surname, France, where it is a rare surname, and Portugal, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Belgium, France, and India. Much less frequently, Гайи is the forename as well as the last name.