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Last name Hoorn (Hoorn , Горн , Хорн ) , worldwide, is quite a common cognomen. The cognomen Hoorn is characteristic of Netherlands, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and South Africa. Measured by absolute frequency, this name is the most popular in Netherlands, Russia, and Kazakhstan. Very seldom, Hoorn is the forename as well as the last name.