Last name Каин (Kain 
, Cain , Kayn ) , around the world, is a widespread cognomen. The family name Каин is habitual in Saint Vincent and the Grenadines, where it is a common surname, Isle of Man, where it is quite a common surname, and Barbados (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and India. Very seldom, Каин is the forename as well as the last name.