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Cognomen Loos (Loos , لوس , לוס , and others...) , all around the world, is a common surname. The last name Loos is characteristic of Belgium, where it is quite a common surname, Netherlands, and Estonia (explore the name in all countries). Measured by absolute frequency, the name is most common in Germany, the United States, and Netherlands. Very seldom, Loos is the forename as well as the last name.