Family name קוסי (Cossey 
, קוסי 
, Coucy 
) , in the world, is quite a rare surname. The cognomen קוסי is habitual in Barbados, where it is quite a common surname, New Zealand, where it is quite a rare surname, and the United Kingdom. In absolute terms, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, קוסי is the forename as well as the last name.