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Last name Sanmartin (Sanmartin , Sanmartín , Санмартин) , in the entire world, is quite a common family name. The cognomen Sanmartin is characteristic of Eswatini, where it is quite a rare surname, Spain, and Colombia. Not in comparison with a country's population, the name is most common in Spain, Colombia, and the United States. Much less frequently, Sanmartin is the forename as well as the last name.