Surname Cosie (Kose 
, Cosie 
) , across the world, is a common family name. The cognomen Cosie is characteristic of Lesotho, where it is quite a common surname, Estonia, and Papua New Guinea, where it is quite a rare surname. In absolute terms, it is commonest in India, Turkey, and Lesotho. Much less frequently, Cosie is the forename as well as the last name.