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Family name Harmon (Harmon , 哈蒙 , הרמון ) , all over the world, is a common cognomen. The cognomen Harmon is habitual in Guam, where it is quite a common surname, Liberia, and the United States (explore the name in all countries). In absolute terms, this name is the most popular in the United States, Liberia, and Canada. Much less frequently, Harmon is the forename as well as the last name.