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The spelling is German but the name looks Slavic. This suggests that the name is either Sorbian, Lusatian, etc., belonging to the Slavic speaking peoples of Eastern Germany; or it's a Czech or Polish name whose spelling has been changed after migration to Germany.
The meaning may be the same as another German/Slav surname, Boschan, which is said to be a diminutive of some Slavic given name such as Boleslav or Boguslav.