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Cognomen Lex (Lex , 雷克斯 , Лекс ) , across the world, is a common last name. The last name Lex is habitual in Austria, where it is quite a rare surname, Fiji, and Israel. Not in comparison with a country's population, this name is the most popular in Germany, Indonesia, and the United States. Likewise, Lex is the forename as well as the last name.