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Cognomen Leach (利奇 , Leach , リーチ , and others...) , throughout the world, is a common last name. The cognomen Leach is characteristic of British Virgin Islands, where it is quite a common surname, Isle of Man, and Guernsey (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Leach is the forename as well as the last name.