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I'm sorry, but I haven't found much. Knaut as a German surname can ne be from Middle High German "knode, knote" (nodule), used for a small, crude and dumpy person.
(This is taken from Familiennamen, Herkunft und Bedeutung, bearbeitet von Rosa und Volker Kohlheim, Dudenverlag Mannheim 2000)

Andy ;—)