Last name クシ (Cusi 
, クシ 
, Kuś 
) , all around the world, is a common family name. The family name クシ is habitual in Peru, where it is quite a common surname, Bolivia, and Poland, where it is quite a rare surname. In absolute terms, it is the most numerous in Peru, Philippines, and Poland. Much less frequently, クシ is the forename as well as the last name.