Surname Гои (Goi 
, 五井 
, Гои 
) , all around the world, is quite a common family name. The family name Гои is habitual in Singapore, where it is quite a rare surname, Italy, and Papua New Guinea. In absolute terms, it is the most numerous in Italy, India, and Brazil. Very seldom, Гои is the forename as well as the last name.