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I found two things:

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1. Johann = short form of Johann(es Baptist or Evangelist/a)

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SEIBICKE, Wilfried: Historisches Deutsches Vornamenbuch, 1996ff.

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2. Johann […] It was a fashion in the 17./18 century to combine Johann with a second forename, which was the actual first name: Johann Sebastian Bach […], Johann Gottfried Herder […], Johann Wolfgang Goethe […]

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KOHLHEIM, Rosa und Volker: Das große Vornamenlexikon, Mannheim 2003

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Hope this helps.

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Andy ;—)