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Last name Steil (เหล็ก , 斯特尔 , Steil ) , in all the world, is quite a common surname. The surname Steil is characteristic of Western Europe, particularly Luxembourg, where it is quite a common surname, Germany, where it is quite a rare surname, and Switzerland. Not in comparison with a country's population, this name is the most popular in Germany, Brazil, and the United States. Very seldom, Steil is the forename as well as the last name.