Last name Kosiy (Kosiy 
, Косый 
, Косий ) , in the world, is quite a common cognomen. The last name Kosiy is characteristic of Ukraine, where it is quite a rare surname, Belarus, where it is a rare surname, and India. Not in comparison with a country's population, it is commonest in India, Ukraine, and Russia. Also, Kosiy is the forename as well as the last name.