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Last name אדר (Eder , Adar , Ader ) , worldwide, is a widespread cognomen. The last name אדר is characteristic of Austria, where it is a common surname, Liechtenstein, where it is quite a common surname, and Israel (explore the name in all countries). In absolute terms, this name is the most popular in Mexico, Germany, and Austria. Likewise, אדר is the forename as well as the last name.