The surname Klang in Sweden has its origins in the early 1800's when it became offical to use surnames for every one (priviously, only middle class and above used surnames) So what happened was that everyone looked at their father and started calling themselves Andersson ie son of Anders or Persson ie son of Per (etc). The problem was that at the same time Sweden had compulsary military service and the army was faced with having a whole regiment full of recruits with surnames ending with "sson". So when the men were called up to do their service they were given a "new" surname, these include Klang, Kling, Marine, Krig, Sjö, and so on. This means that although there are a number of Klangs in Sweden we are not related.
My familly comes from Lysekil on the Swedish West Coast my grandfather was the youngest of 13 children and I have been told that all the other 12 moved to the US around the 1890's and 1900's. This means that I must have several 2nd cousins some where in the US.
Anyway good luck to all the Klangs out there searching for their forfathers.