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All over the world, Klau (Klau ) is quite a rare mostly girly, but uncommonly boy's given name. The given name Klau is characteristic of Albania, where it is quite a rare epicene name, El Salvador, where it is quite a rare girly name, and Guatemala, where it is a rare feminine name. In absolute terms, it is commonest in Poland, Colombia, and Albania. More frequently, Klau is the last name as well as the forename.