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Last name Koso (Koso , Косо , كوسو ) , globally, is a common family name. The cognomen Koso is characteristic of Pakistan, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and Serbia. Measured by absolute frequency, this name is the most popular in Pakistan, Indonesia, and Nigeria. Very seldom, Koso is the forename as well as the last name.