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Last name Plech (Plech , Плеш ) , all over the world, is a rare cognomen. The cognomen Plech is characteristic of Austria, where it is quite a rare surname, Azerbaijan, and Slovakia, where it is a rare surname. Not in comparison with a country's population, the name is most common in Poland, Russia, and Austria. Very seldom, Plech is the forename as well as the last name.