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Last name Wlach (Wlach , Влах ) , globally, is quite a rare cognomen. The last name Wlach is characteristic of Moldova, where it is quite a rare surname, Ukraine, where it is a rare surname, and Austria. Not in comparison with a country's population, it most frequently occurs in Ukraine, Moldova, and Germany. Much less frequently, Wlach is the forename as well as the last name.