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Surname 古 (Ku , Gu , 古 , and others...) , worldwide, is a prevalent last name. The last name 古 is habitual in Macao, where it is a common surname, Cayman Islands, and South Korea (explore the name in all countries). In absolute terms, it is commonest in China, South Korea, and India. Also, 古 is the forename as well as the last name.