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Cognomen Isler (Isler , Ислер ) , all over the world, is quite a common surname. The last name Isler is characteristic of Switzerland, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and France, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Switzerland, the United States, and Germany. Much less frequently, Isler is the forename as well as the last name.