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Last name Ramadhan (Ramadhan ) , throughout the world, is a widespread surname. The last name Ramadhan is characteristic of Indonesia, where it is a common surname, Bahrain, where it is quite a common surname, and Tanzania (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Indonesia, Tanzania, and Kenya. Much less frequently, Ramadhan is the forename as well as the last name.