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Surname Jammer (Jammer , ימר , יאמר ) , in all the world, is quite a rare cognomen. The last name Jammer is characteristic of Estonia, where it is quite a rare surname, Israel, and Austria. Not in comparison with a country's population, it is the most numerous in the United States, Germany, and Israel. Very seldom, Jammer is the forename as well as the last name.