Surname Кадои (Kadoi 
, 角井 
, Кадои 
) , in the world, is a rare family name. The family name Кадои is habitual in Armenia, where it is a rare surname, Algeria, where it is a very rare surname, and Malaysia. Measured by absolute frequency, this name is the most popular in India, Algeria, and Indonesia. Much less frequently, Кадои is the forename as well as the last name.