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The Vonau family name can be found in many genealogy websites. It originates in Middle Europe and is mostly used in Germany which is understandable as Germany has the highest population in this area.
The name has the forms of Von Au which is believed to come from Von Owe or Von Owa. It's a family name which is almost 900 years old.
Check this web page, you will find more than you expect:
http://genforum.genealogy.com/vonau/messages/1.html
Hope this helps and have a great day!
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