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Last name Sach (Sach , Саш , Сач ) , across the world, is quite a rare cognomen. The surname Sach is characteristic of Czechia, where it is quite a rare surname, Germany, and the United Kingdom, where it is a rare surname. In absolute terms, it is commonest in Germany, the United Kingdom, and Indonesia. Much less frequently, Sach is the forename as well as the last name.