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Last name Klong (Klong , กลอง , กล่อง) , worldwide, is a rare cognomen. The last name Klong is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Indonesia, where it is a very rare surname, and Thailand. In absolute terms, this name is the most popular in Malaysia, Indonesia, and the United States. More prevalently, Klong is the forename as well as the last name.