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Family name Merx (Merced , Mercer , Merx ) , all around the world, is a common cognomen. The last name Merx is characteristic of Puerto Rico, where it is quite a common surname, Curacao, and Isle of Man (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, Mexico, and the United Kingdom. Much less frequently, Merx is the forename as well as the last name.