Cognomen Кой (Coy 
, Koy , Koj 
) , all around the world, is a common family name. The cognomen Кой is habitual in Latin America and the Caribbean, particularly British Virgin Islands, where it is quite a common surname, Guatemala, and Belize (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Indonesia, the United States, and Guatemala. Very seldom, Кой is the forename as well as the last name.