Vizualizing the regional distribution of surnames

With the help of data from telephone directories it is possible to visualize the regional distribution of surnames. So you can draw conclusions about their origin. There are appropriate websites concerning family names in the

More complicated is the search for Polish names: By submitting a name, the heraldic-genealogical service provides a code, which you have to copy and paste into a form on the website of GenPol (Genealogia Polska) for displaying a map, that shows the distribution of people with this surname in Poland.