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Family name Cobain (Cobain , 柯本 , コバーン) , all around the world, is quite a common surname. The last name Cobain is characteristic of Indonesia, where it is quite a rare surname, El Salvador, where it is a rare surname, and the United Kingdom. In absolute terms, it is commonest in Indonesia, the United Kingdom, and the United States. Much less frequently, Cobain is the forename as well as the last name.