Surname كوسبي (Cosby 
, Causby 
, Kosbi 
) , in the world, is a common family name. The cognomen كوسبي is characteristic of Guam, where it is quite a common surname, the United States, where it is quite a rare surname, and Ghana. Not in comparison with a country's population, it is the most numerous in the United States, Ghana, and the United Kingdom. Much less frequently, كوسبي is the forename as well as the last name.