Schleier
Since the spooks like all words that mean “veil”, the German term Schleier for “veil” has become a popular name for them. Variants are Schleiermacher, Schleiermann, Schleyer, Schleer, Schlier, possibly also Schliemann and Schiller.
German Schleier = veil
Schleier : veil; haze, mist — German (Wikt)