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Family name Lach (拉 , Lach , Лах ) , around the world, is a common surname. The cognomen Lach is characteristic of Eastern Europe, particularly Poland, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Czechia. In absolute terms, the name is most common in China, Poland, and Germany. Also, Lach is the forename as well as the last name.