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Surname Laach (Lache , Laach , Лаах ) , across the world, is quite a rare cognomen. The cognomen Laach is habitual in Romania, where it is quite a rare surname, Colombia, and Peru, where it is a rare surname. In absolute terms, this name is the most popular in Colombia, Romania, and Germany. Much less frequently, Laach is the forename as well as the last name.