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Last name Lemmon (レモン , 莱蒙 , Lemmon ) , worldwide, is quite a common family name. The last name Lemmon is habitual in Marshall Islands, where it is a common surname, the United States, where it is quite a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Canada. Much less frequently, Lemmon is the forename as well as the last name.