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Last name Sumarr (Sommer , Sumarr) , worldwide, is a common cognomen. The last name Sumarr is habitual in Greenland, where it is a common surname, Switzerland, where it is quite a common surname, and Germany (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Switzerland. Much less frequently, Sumarr is the forename as well as the last name.