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-itzes, -ows, -dorfs- and -hausens

Moritz Stefaner, at truth and beauty, put together a list of the geographical frequency of place names in Germany. The whole map can be seen here. A few selections:

Place names Unspecified

I get that -ow and -itz are going to be mostly in the East, since they are usually transliterations of Polish words. But it would be interesting to know why certain other kinds of place names appear in such geographically distinct patterns.